diff --git a/repos/base-fiasco/lib/mk/base-common.mk b/repos/base-fiasco/lib/mk/base-common.mk
index 8cf7bbb60..e03587682 100644
--- a/repos/base-fiasco/lib/mk/base-common.mk
+++ b/repos/base-fiasco/lib/mk/base-common.mk
@@ -24,8 +24,7 @@ SRC_CC += thread/myself.cc
 SRC_CC += thread/context_allocator.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath cap_copy.cc $(BASE_DIR)/src/lib/startup
 vpath %.cc        $(REP_DIR)/src/base
diff --git a/repos/base-fiasco/lib/mk/base.mk b/repos/base-fiasco/lib/mk/base.mk
index 5e7bdf98c..6510601ba 100644
--- a/repos/base-fiasco/lib/mk/base.mk
+++ b/repos/base-fiasco/lib/mk/base.mk
@@ -13,7 +13,7 @@ SRC_CC += thread/thread_start.cc
 SRC_CC += irq/platform.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-fiasco/src/core/target.inc b/repos/base-fiasco/src/core/target.inc
index 210abfa6e..df5d270cb 100644
--- a/repos/base-fiasco/src/core/target.inc
+++ b/repos/base-fiasco/src/core/target.inc
@@ -37,8 +37,8 @@ SRC_CC      += context_area.cc \
 
 INC_DIR     += $(REP_DIR)/src/core/include \
                $(GEN_CORE_DIR)/include \
-               $(REP_DIR)/src/base/console \
-               $(BASE_DIR)/src/base/thread
+               $(REP_DIR)/src/include \
+               $(BASE_DIR)/src/include
 
 LIBS        += base-common
 
diff --git a/repos/base-fiasco/src/base/console/core_console.h b/repos/base-fiasco/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-fiasco/src/base/console/core_console.h
rename to repos/base-fiasco/src/include/base/internal/core_console.h
diff --git a/repos/base-fiasco/src/base/lock/lock_helper.h b/repos/base-fiasco/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-fiasco/src/base/lock/lock_helper.h
rename to repos/base-fiasco/src/include/base/internal/lock_helper.h
diff --git a/repos/base-foc/lib/mk/base-common.mk b/repos/base-foc/lib/mk/base-common.mk
index ed32cd7c1..083daa015 100644
--- a/repos/base-foc/lib/mk/base-common.mk
+++ b/repos/base-foc/lib/mk/base-common.mk
@@ -24,9 +24,7 @@ SRC_CC += thread/myself.cc
 SRC_CC += thread/context_allocator.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-foc/lib/mk/base.mk b/repos/base-foc/lib/mk/base.mk
index 459a00389..bb3e929e2 100644
--- a/repos/base-foc/lib/mk/base.mk
+++ b/repos/base-foc/lib/mk/base.mk
@@ -14,7 +14,7 @@ SRC_CC += thread/thread_start.cc
 SRC_CC += irq/platform.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-foc/src/base/env/cap_map.cc b/repos/base-foc/src/base/env/cap_map.cc
index 64ccde64c..522722a4c 100644
--- a/repos/base-foc/src/base/env/cap_map.cc
+++ b/repos/base-foc/src/base/env/cap_map.cc
@@ -13,14 +13,16 @@
  * under the terms of the GNU General Public License version 2.
  */
 
+/* Genode includes */
 #include <base/cap_map.h>
 #include <base/native_types.h>
 
 #include <util/assert.h>
 
-/* Lock implementation local include */
-#include <spin_lock.h>
+/* base-internal includes */
+#include <base/internal/spin_lock.h>
 
+/* kernel includes */
 namespace Fiasco {
 #include <l4/sys/consts.h>
 #include <l4/sys/task.h>
diff --git a/repos/base-foc/src/base/env/spin_lock.cc b/repos/base-foc/src/base/env/spin_lock.cc
index 2f686f5ce..eacb70f41 100644
--- a/repos/base-foc/src/base/env/spin_lock.cc
+++ b/repos/base-foc/src/base/env/spin_lock.cc
@@ -16,8 +16,8 @@
 /* Genode includes */
 #include <base/cap_map.h>
 
-/* Lock implementation local include */
-#include <spin_lock.h>
+/* base-internal includes */
+#include <base/internal/spin_lock.h>
 
 
 Genode::Spin_lock::Spin_lock() : _spinlock(SPINLOCK_UNLOCKED) {}
diff --git a/repos/base-foc/src/base/ipc/ipc.cc b/repos/base-foc/src/base/ipc/ipc.cc
index 5c8ca86d0..2aec85440 100644
--- a/repos/base-foc/src/base/ipc/ipc.cc
+++ b/repos/base-foc/src/base/ipc/ipc.cc
@@ -27,8 +27,8 @@
 #include <base/thread.h>
 #include <util/assert.h>
 
-/* base-foc/src/base/lock */
-#include <lock_helper.h> /* for 'thread_get_my_native_id()' */
+/* base-internal includes */
+#include <base/internal/lock_helper.h> /* for 'thread_get_my_native_id()' */
 
 /* Fiasco.OC includes */
 namespace Fiasco {
diff --git a/repos/base-foc/src/core/target.inc b/repos/base-foc/src/core/target.inc
index 1f4295f49..cb894d738 100644
--- a/repos/base-foc/src/core/target.inc
+++ b/repos/base-foc/src/core/target.inc
@@ -40,10 +40,8 @@ SRC_CC      += context_area.cc \
 
 INC_DIR     += $(REP_DIR)/src/core/include \
                $(GEN_CORE_DIR)/include \
-               $(REP_DIR)/src/base/lock \
-               $(BASE_DIR)/src/base/lock \
-               $(BASE_DIR)/src/base/thread \
-               $(REP_DIR)/src/base/console
+               $(REP_DIR)/src/include \
+               $(BASE_DIR)/src/include
 
 include $(GEN_CORE_DIR)/version.inc
 
diff --git a/repos/base-foc/src/base/console/core_console.h b/repos/base-foc/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-foc/src/base/console/core_console.h
rename to repos/base-foc/src/include/base/internal/core_console.h
diff --git a/repos/base-foc/src/base/lock/lock_helper.h b/repos/base-foc/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-foc/src/base/lock/lock_helper.h
rename to repos/base-foc/src/include/base/internal/lock_helper.h
diff --git a/repos/base-foc/src/lib/startup/_main_parent_cap.h b/repos/base-foc/src/include/startup/internal/_main_parent_cap.h
similarity index 84%
rename from repos/base-foc/src/lib/startup/_main_parent_cap.h
rename to repos/base-foc/src/include/startup/internal/_main_parent_cap.h
index 135066111..7378518d6 100644
--- a/repos/base-foc/src/lib/startup/_main_parent_cap.h
+++ b/repos/base-foc/src/include/startup/internal/_main_parent_cap.h
@@ -11,8 +11,8 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#ifndef _LIB__STARTUP___MAIN_PARENT_CAP_H_
-#define _LIB__STARTUP___MAIN_PARENT_CAP_H_
+#ifndef _INCLUDE__STARTUP__INTERNAL___MAIN_PARENT_CAP_H_
+#define _INCLUDE__STARTUP__INTERNAL___MAIN_PARENT_CAP_H_
 
 #include <base/native_types.h>
 
@@ -41,4 +41,4 @@ namespace Genode {
 	}
 }
 
-#endif /* _LIB__STARTUP___MAIN_PARENT_CAP_H_ */
+#endif /* _INCLUDE__STARTUP__INTERNAL___MAIN_PARENT_CAP_H_ */
diff --git a/repos/base-hw/lib/mk/base-common.inc b/repos/base-hw/lib/mk/base-common.inc
index 675aa63ee..2e4320f6a 100644
--- a/repos/base-hw/lib/mk/base-common.inc
+++ b/repos/base-hw/lib/mk/base-common.inc
@@ -1,14 +1,12 @@
 #
-# \brief  Portions of base library shared by core and non-core processes
+# \brief  Portions of base library shared by core and non-core components
 # \author Norman Feske
 # \author Martin Stein
 # \date   2013-02-14
 #
 
-# add library dependencies
 LIBS += cxx
 
-# add C++ sources
 SRC_CC += ipc/ipc.cc
 SRC_CC += avl_tree/avl_tree.cc
 SRC_CC += allocator/slab.cc
@@ -31,11 +29,7 @@ SRC_CC += thread/context_allocator.cc
 SRC_CC += kernel/interface.cc
 SRC_CC += sleep.cc
 
-# add include paths
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
-# declare source locations
 vpath %  $(REP_DIR)/src/base
 vpath % $(BASE_DIR)/src/base
diff --git a/repos/base-hw/lib/mk/base.mk b/repos/base-hw/lib/mk/base.mk
index 562d217dd..278588f47 100644
--- a/repos/base-hw/lib/mk/base.mk
+++ b/repos/base-hw/lib/mk/base.mk
@@ -1,13 +1,11 @@
 #
-# \brief  Portions of base library that are exclusive to non-core processes
+# \brief  Portions of base library that are exclusive to non-core components
 # \author Norman Feske
 # \date   2013-02-14
 #
 
-# add library dependencies
 LIBS += base-common startup
 
-# add C++ sources
 SRC_CC += console/log_console.cc
 SRC_CC += cpu/cache.cc
 SRC_CC += env/env.cc
@@ -19,11 +17,7 @@ SRC_CC += env.cc
 SRC_CC += capability.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-# add include paths
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
-# declare source locations
 vpath %  $(REP_DIR)/src/base
 vpath % $(BASE_DIR)/src/base
diff --git a/repos/base-hw/lib/mk/core.inc b/repos/base-hw/lib/mk/core.inc
index 1b5989b91..ea7773ba6 100644
--- a/repos/base-hw/lib/mk/core.inc
+++ b/repos/base-hw/lib/mk/core.inc
@@ -11,11 +11,8 @@ LIBS += core-perf_counter
 LIBS += base-common
 
 # add include paths
-INC_DIR +=  $(REP_DIR)/src/core/include
-INC_DIR += $(BASE_DIR)/src/core/include
-INC_DIR += $(BASE_DIR)/src/base/include
-INC_DIR += $(BASE_DIR)/src/base/thread
-INC_DIR += $(BASE_DIR)/src/lib/startup
+INC_DIR += $(REP_DIR)/src/core/include $(BASE_DIR)/src/core/include
+INC_DIR += $(REP_DIR)/src/include      $(BASE_DIR)/src/include
 
 # add C++ sources
 SRC_CC += console.cc
diff --git a/repos/base-hw/src/base/capability.cc b/repos/base-hw/src/base/capability.cc
index 497133d9d..02d664a97 100644
--- a/repos/base-hw/src/base/capability.cc
+++ b/repos/base-hw/src/base/capability.cc
@@ -12,9 +12,11 @@
  */
 
 /* Genode includes */
-#include <spin_lock.h>
 #include <base/capability.h>
 
+/* base-internal includes */
+#include <base/internal/spin_lock.h>
+
 static volatile int    spinlock = SPINLOCK_UNLOCKED;
 static Genode::uint8_t ref_counter[1 << (sizeof(Kernel::capid_t)*8)];
 
diff --git a/repos/base-hw/src/core/console.cc b/repos/base-hw/src/core/console.cc
index 24339a620..9f0fb52c0 100644
--- a/repos/base-hw/src/core/console.cc
+++ b/repos/base-hw/src/core/console.cc
@@ -18,8 +18,8 @@
 /* core includes */
 #include <serial.h>
 
-/* base includes */
-#include <unmanaged_singleton.h>
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 namespace Genode
 {
diff --git a/repos/base-hw/src/core/include/kernel/irq.h b/repos/base-hw/src/core/include/kernel/irq.h
index 60ac5c79c..71e521880 100644
--- a/repos/base-hw/src/core/include/kernel/irq.h
+++ b/repos/base-hw/src/core/include/kernel/irq.h
@@ -18,9 +18,11 @@
 /* Genode includes */
 #include <base/native_types.h>
 #include <irq_session/irq_session.h>
-#include <unmanaged_singleton.h>
 #include <util/avl_tree.h>
 
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
+
 /* core includes */
 #include <kernel/signal_receiver.h>
 
diff --git a/repos/base-hw/src/core/include/pager.h b/repos/base-hw/src/core/include/pager.h
index c48fc7fc1..4acbf38bb 100644
--- a/repos/base-hw/src/core/include/pager.h
+++ b/repos/base-hw/src/core/include/pager.h
@@ -19,7 +19,9 @@
 #include <base/object_pool.h>
 #include <base/signal.h>
 #include <pager/capability.h>
-#include <unmanaged_singleton.h>
+
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 /* core-local includes */
 #include <kernel/signal_receiver.h>
diff --git a/repos/base-hw/src/core/include/spec/x86/cpu_support.h b/repos/base-hw/src/core/include/spec/x86/cpu_support.h
index 3b9206170..cc9d0ac74 100644
--- a/repos/base-hw/src/core/include/spec/x86/cpu_support.h
+++ b/repos/base-hw/src/core/include/spec/x86/cpu_support.h
@@ -22,7 +22,7 @@
 #include <cpu/cpu_state.h>
 
 /* base includes */
-#include <unmanaged_singleton.h>
+#include <base/internal/unmanaged_singleton.h>
 
 /* core includes */
 #include <fpu.h>
diff --git a/repos/base-hw/src/core/kernel/cpu.cc b/repos/base-hw/src/core/kernel/cpu.cc
index 3c74ba727..4d470bb58 100644
--- a/repos/base-hw/src/core/kernel/cpu.cc
+++ b/repos/base-hw/src/core/kernel/cpu.cc
@@ -22,8 +22,8 @@
 #include <timer.h>
 #include <assert.h>
 
-/* base includes */
-#include <unmanaged_singleton.h>
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 using namespace Kernel;
 
diff --git a/repos/base-hw/src/core/kernel/init.cc b/repos/base-hw/src/core/kernel/init.cc
index 5c0cd89e0..0b5b2eaff 100644
--- a/repos/base-hw/src/core/kernel/init.cc
+++ b/repos/base-hw/src/core/kernel/init.cc
@@ -22,7 +22,7 @@
 #include <platform_thread.h>
 
 /* base includes */
-#include <unmanaged_singleton.h>
+#include <base/internal/unmanaged_singleton.h>
 #include <base/native_types.h>
 
 using namespace Kernel;
diff --git a/repos/base-hw/src/core/kernel/pd.cc b/repos/base-hw/src/core/kernel/pd.cc
index c9295a4c3..ae09dcfb1 100644
--- a/repos/base-hw/src/core/kernel/pd.cc
+++ b/repos/base-hw/src/core/kernel/pd.cc
@@ -19,7 +19,9 @@
 /* Genode includes */
 #include <assert.h>
 #include <page_flags.h>
-#include <unmanaged_singleton.h>
+
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 using namespace Kernel;
 
diff --git a/repos/base-hw/src/core/kernel/thread.cc b/repos/base-hw/src/core/kernel/thread.cc
index 4f4063517..abc7b0614 100644
--- a/repos/base-hw/src/core/kernel/thread.cc
+++ b/repos/base-hw/src/core/kernel/thread.cc
@@ -14,10 +14,12 @@
 
 /* Genode includes */
 #include <base/thread_state.h>
-#include <unmanaged_singleton.h>
 #include <cpu_session/cpu_session.h>
 #include <util/construct_at.h>
 
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
+
 /* core includes */
 #include <assert.h>
 #include <kernel/kernel.h>
diff --git a/repos/base-hw/src/core/platform.cc b/repos/base-hw/src/core/platform.cc
index 28bc91bcd..48a75bb7a 100644
--- a/repos/base-hw/src/core/platform.cc
+++ b/repos/base-hw/src/core/platform.cc
@@ -136,7 +136,7 @@ Platform::Platform()
 	init_alloc(_core_mem_alloc.virt_alloc(), virt_region,
 	           _core_only_ram_regions, get_page_size_log2());
 
-	/* preserve context area in core's virtual address space */
+	/* preserve stack area in core's virtual address space */
 	_core_mem_alloc.virt_alloc()->remove_range(
 		Native_config::context_area_virtual_base(),
 		Native_config::context_area_virtual_size());
diff --git a/repos/base-hw/src/core/spec/arm/smp/kernel/cpu.cc b/repos/base-hw/src/core/spec/arm/smp/kernel/cpu.cc
index 2f5ce7336..702e6f8fe 100644
--- a/repos/base-hw/src/core/spec/arm/smp/kernel/cpu.cc
+++ b/repos/base-hw/src/core/spec/arm/smp/kernel/cpu.cc
@@ -16,8 +16,8 @@
 #include <kernel/kernel.h>
 #include <kernel/cpu.h>
 
-/* base includes */
-#include <unmanaged_singleton.h>
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 
 /* spin-lock used to synchronize kernel access of different cpus */
diff --git a/repos/base-hw/src/core/spec/panda/platform_support.cc b/repos/base-hw/src/core/spec/panda/platform_support.cc
index 2dd72d26b..82aa51d2d 100644
--- a/repos/base-hw/src/core/spec/panda/platform_support.cc
+++ b/repos/base-hw/src/core/spec/panda/platform_support.cc
@@ -17,7 +17,9 @@
 #include <cpu.h>
 #include <pic.h>
 #include <cortex_a9_wugen.h>
-#include <unmanaged_singleton.h>
+
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 using namespace Genode;
 
diff --git a/repos/base-hw/src/core/spec/zynq/platform_support.cc b/repos/base-hw/src/core/spec/zynq/platform_support.cc
index e84d9db34..daadb30e8 100644
--- a/repos/base-hw/src/core/spec/zynq/platform_support.cc
+++ b/repos/base-hw/src/core/spec/zynq/platform_support.cc
@@ -17,7 +17,9 @@
 #include <board.h>
 #include <cpu.h>
 #include <pic.h>
-#include <unmanaged_singleton.h>
+
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 using namespace Genode;
 
diff --git a/repos/base-hw/src/base/lock/lock_helper.h b/repos/base-hw/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-hw/src/base/lock/lock_helper.h
rename to repos/base-hw/src/include/base/internal/lock_helper.h
diff --git a/repos/base-hw/src/lib/startup/_main_parent_cap.h b/repos/base-hw/src/include/startup/internal/_main_parent_cap.h
similarity index 100%
rename from repos/base-hw/src/lib/startup/_main_parent_cap.h
rename to repos/base-hw/src/include/startup/internal/_main_parent_cap.h
diff --git a/repos/base-linux/lib/mk/base-common.mk b/repos/base-linux/lib/mk/base-common.mk
index 2b112b3ea..0d5b2ae76 100644
--- a/repos/base-linux/lib/mk/base-common.mk
+++ b/repos/base-linux/lib/mk/base-common.mk
@@ -23,11 +23,7 @@ SRC_CC += thread/trace.cc thread/thread_env.cc thread/context_allocator.cc
 SRC_CC += irq/platform.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock $(BASE_DIR)/src/base/lock
-INC_DIR +=  $(REP_DIR)/src/base/ipc
-INC_DIR +=  $(REP_DIR)/src/base/env $(BASE_DIR)/src/base/env
-INC_DIR +=  $(BASE_DIR)/src/lib/startup
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-linux/lib/mk/base.inc b/repos/base-linux/lib/mk/base.inc
index dcc8d55a0..4aec5c560 100644
--- a/repos/base-linux/lib/mk/base.inc
+++ b/repos/base-linux/lib/mk/base.inc
@@ -13,7 +13,7 @@ SRC_CC += console/log_console.cc
 SRC_CC += env/env.cc env/platform_env.cc env/context_area.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR += $(REP_DIR)/src/base/env $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-linux/lib/mk/base.mk b/repos/base-linux/lib/mk/base.mk
index d0094b62f..a5bce959c 100644
--- a/repos/base-linux/lib/mk/base.mk
+++ b/repos/base-linux/lib/mk/base.mk
@@ -5,6 +5,7 @@
 #
 
 LIBS   += startup cxx
+
 SRC_CC += thread/thread.cc thread/myself.cc thread/thread_linux.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
diff --git a/repos/base-linux/src/base/env/platform_env.cc b/repos/base-linux/src/base/env/platform_env.cc
index ac0df8346..347897c1a 100644
--- a/repos/base-linux/src/base/env/platform_env.cc
+++ b/repos/base-linux/src/base/env/platform_env.cc
@@ -17,8 +17,8 @@
 #include <linux_dataspace/client.h>
 #include <linux_syscalls.h>
 
-/* local includes */
-#include <platform_env.h>
+/* base-internal includes */
+#include <base/internal/platform_env.h>
 
 using namespace Genode;
 
diff --git a/repos/base-linux/src/base/env/rm_session_mmap.cc b/repos/base-linux/src/base/env/rm_session_mmap.cc
index 0547dc29f..8b5b32427 100644
--- a/repos/base-linux/src/base/env/rm_session_mmap.cc
+++ b/repos/base-linux/src/base/env/rm_session_mmap.cc
@@ -37,10 +37,10 @@
 #include <base/thread.h>
 #include <linux_dataspace/client.h>
 #include <linux_syscalls.h>
-#include <context_area.h>
 
-/* local includes */
-#include <platform_env.h>
+/* base-internal includes */
+#include <base/internal/platform_env.h>
+#include <base/internal/context_area.h>
 
 using namespace Genode;
 
diff --git a/repos/base-linux/src/base/ipc/ipc.cc b/repos/base-linux/src/base/ipc/ipc.cc
index 7aba89e1b..55a331660 100644
--- a/repos/base-linux/src/base/ipc/ipc.cc
+++ b/repos/base-linux/src/base/ipc/ipc.cc
@@ -34,8 +34,8 @@
 #include <base/env.h>
 #include <linux_cpu_session/linux_cpu_session.h>
 
-/* local includes */
-#include <socket_descriptor_registry.h>
+/* base-internal includes */
+#include <base/internal/socket_descriptor_registry.h>
 
 /* Linux includes */
 #include <linux_syscalls.h>
diff --git a/repos/base-linux/src/core/context_area.cc b/repos/base-linux/src/core/context_area.cc
index 71f2553f4..6137b415a 100644
--- a/repos/base-linux/src/core/context_area.cc
+++ b/repos/base-linux/src/core/context_area.cc
@@ -17,7 +17,8 @@
 #include <base/printf.h>
 #include <base/thread.h>
 
-#include <context_area.h>
+/* base-internal includes */
+#include <base/internal/context_area.h>
 
 
 /**
diff --git a/repos/base-linux/src/core/include/core_env.h b/repos/base-linux/src/core/include/core_env.h
index e95aed2e8..00574231b 100644
--- a/repos/base-linux/src/core/include/core_env.h
+++ b/repos/base-linux/src/core/include/core_env.h
@@ -25,8 +25,8 @@
 #include <ram_session_component.h>
 #include <core_pd_session.h>
 
-/* internal base includes */
-#include <platform_env.h>
+/* base-internal includes */
+#include <base/internal/platform_env.h>
 
 
 namespace Genode {
diff --git a/repos/base-linux/src/core/include/server_socket_pair.h b/repos/base-linux/src/core/include/server_socket_pair.h
index 62fcaf936..68d18275f 100644
--- a/repos/base-linux/src/core/include/server_socket_pair.h
+++ b/repos/base-linux/src/core/include/server_socket_pair.h
@@ -19,8 +19,8 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 
-/* include from 'src/base/ipc' */
-#include <socket_descriptor_registry.h>
+/* base-internal includes */
+#include <base/internal/socket_descriptor_registry.h>
 
 /* core-local includes */
 #include <resource_path.h>
diff --git a/repos/base-linux/src/core/target.mk b/repos/base-linux/src/core/target.mk
index a3851c303..e77cd1389 100644
--- a/repos/base-linux/src/core/target.mk
+++ b/repos/base-linux/src/core/target.mk
@@ -31,11 +31,8 @@ SRC_CC        = main.cc \
 INC_DIR      += $(REP_DIR)/src/core/include \
                 $(GEN_CORE_DIR)/include \
                 $(REP_DIR)/src/platform \
-                $(REP_DIR)/src/base/ipc \
-                $(REP_DIR)/src/base/env \
-                $(BASE_DIR)/src/base/env \
-                $(REP_DIR)/src/base/console \
-                $(BASE_DIR)/src/base/thread \
+                $(REP_DIR)/src/include \
+                $(BASE_DIR)/src/include
 
 HOST_INC_DIR += /usr/include
 
diff --git a/repos/base-linux/src/base/env/context_area.h b/repos/base-linux/src/include/base/internal/context_area.h
similarity index 100%
rename from repos/base-linux/src/base/env/context_area.h
rename to repos/base-linux/src/include/base/internal/context_area.h
diff --git a/repos/base-linux/src/base/console/core_console.h b/repos/base-linux/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-linux/src/base/console/core_console.h
rename to repos/base-linux/src/include/base/internal/core_console.h
diff --git a/repos/base-linux/src/base/lock/lock_helper.h b/repos/base-linux/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-linux/src/base/lock/lock_helper.h
rename to repos/base-linux/src/include/base/internal/lock_helper.h
diff --git a/repos/base-linux/src/base/env/platform_env.h b/repos/base-linux/src/include/base/internal/platform_env.h
similarity index 99%
rename from repos/base-linux/src/base/env/platform_env.h
rename to repos/base-linux/src/include/base/internal/platform_env.h
index 85ec614c4..3678e0da2 100644
--- a/repos/base-linux/src/base/env/platform_env.h
+++ b/repos/base-linux/src/include/base/internal/platform_env.h
@@ -27,8 +27,8 @@
 #include <base/heap.h>
 #include <linux_cpu_session/client.h>
 
-/* local includes (from 'base/src/base/env/') */
-#include <platform_env_common.h>
+/* base-internal includes */
+#include <base/internal/platform_env_common.h>
 
 
 namespace Genode {
diff --git a/repos/base-linux/src/base/ipc/socket_descriptor_registry.h b/repos/base-linux/src/include/base/internal/socket_descriptor_registry.h
similarity index 100%
rename from repos/base-linux/src/base/ipc/socket_descriptor_registry.h
rename to repos/base-linux/src/include/base/internal/socket_descriptor_registry.h
diff --git a/repos/base-nova/lib/mk/base-common.mk b/repos/base-nova/lib/mk/base-common.mk
index 906931672..88b6fbd26 100644
--- a/repos/base-nova/lib/mk/base-common.mk
+++ b/repos/base-nova/lib/mk/base-common.mk
@@ -23,9 +23,7 @@ SRC_CC += thread/myself.cc
 SRC_CC += thread/context_allocator.cc env/cap_map.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-nova/lib/mk/base.mk b/repos/base-nova/lib/mk/base.mk
index 1b4231ce4..502d4204c 100644
--- a/repos/base-nova/lib/mk/base.mk
+++ b/repos/base-nova/lib/mk/base.mk
@@ -13,7 +13,7 @@ SRC_CC += thread/thread_nova.cc
 SRC_CC += irq/platform.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-nova/src/core/target.inc b/repos/base-nova/src/core/target.inc
index 61ff7c5ef..d62f9974f 100644
--- a/repos/base-nova/src/core/target.inc
+++ b/repos/base-nova/src/core/target.inc
@@ -40,9 +40,8 @@ SRC_CC       = context_area.cc \
                trace_session_component.cc
 
 INC_DIR      = $(REP_DIR)/src/core/include \
-               $(REP_DIR)/src/base/console \
-               $(BASE_DIR)/src/base/thread \
-               $(BASE_DIR)/src/base/include \
+               $(REP_DIR)/src/include \
+               $(BASE_DIR)/src/include \
                $(GEN_CORE_DIR)/include
 
 include $(GEN_CORE_DIR)/version.inc
diff --git a/repos/base-nova/src/base/console/core_console.h b/repos/base-nova/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-nova/src/base/console/core_console.h
rename to repos/base-nova/src/include/base/internal/core_console.h
diff --git a/repos/base-nova/src/base/lock/lock_helper.h b/repos/base-nova/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-nova/src/base/lock/lock_helper.h
rename to repos/base-nova/src/include/base/internal/lock_helper.h
diff --git a/repos/base-nova/src/base/lock/spin_lock.h b/repos/base-nova/src/include/base/internal/spin_lock.h
similarity index 97%
rename from repos/base-nova/src/base/lock/spin_lock.h
rename to repos/base-nova/src/include/base/internal/spin_lock.h
index 8ebf1244f..a991dbd8c 100644
--- a/repos/base-nova/src/base/lock/spin_lock.h
+++ b/repos/base-nova/src/include/base/internal/spin_lock.h
@@ -19,8 +19,8 @@
 #include <cpu/memory_barrier.h>
 #include <base/thread.h>
 
-/* local includes */
-#include <lock_helper.h>
+/* base-internal includes */
+#include <base/internal/lock_helper.h>
 
 
 enum State {
diff --git a/repos/base-nova/src/lib/startup/_main_parent_cap.h b/repos/base-nova/src/include/startup/internal/_main_parent_cap.h
similarity index 100%
rename from repos/base-nova/src/lib/startup/_main_parent_cap.h
rename to repos/base-nova/src/include/startup/internal/_main_parent_cap.h
diff --git a/repos/base-okl4/lib/mk/base-common.mk b/repos/base-okl4/lib/mk/base-common.mk
index c736157a1..e03587682 100644
--- a/repos/base-okl4/lib/mk/base-common.mk
+++ b/repos/base-okl4/lib/mk/base-common.mk
@@ -24,9 +24,7 @@ SRC_CC += thread/myself.cc
 SRC_CC += thread/context_allocator.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath cap_copy.cc $(BASE_DIR)/src/lib/startup
 vpath %.cc        $(REP_DIR)/src/base
diff --git a/repos/base-okl4/lib/mk/base.mk b/repos/base-okl4/lib/mk/base.mk
index 90b0c746b..e7e1f392f 100644
--- a/repos/base-okl4/lib/mk/base.mk
+++ b/repos/base-okl4/lib/mk/base.mk
@@ -8,6 +8,6 @@ SRC_CC += server/rpc_cap_alloc.cc
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
 
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 LIBS += base-common
diff --git a/repos/base-okl4/lib/mk/boot_info.mk b/repos/base-okl4/lib/mk/boot_info.mk
index 13cebd141..cb8f15929 100644
--- a/repos/base-okl4/lib/mk/boot_info.mk
+++ b/repos/base-okl4/lib/mk/boot_info.mk
@@ -1,5 +1,5 @@
 SRC_C    = bootinfo.c
-INC_DIR += $(REP_DIR)/src/base/bootinfo
+INC_DIR += $(REP_DIR)/src/include/bootinfo/internal
 CC_WARN  = -Wall -Wno-attributes
 
 vpath bootinfo.c $(OKL4_DIR)/libs/bootinfo/src
diff --git a/repos/base-okl4/src/core/target.inc b/repos/base-okl4/src/core/target.inc
index 02f471dac..db1dcb1da 100644
--- a/repos/base-okl4/src/core/target.inc
+++ b/repos/base-okl4/src/core/target.inc
@@ -37,11 +37,8 @@ SRC_CC += context_area.cc \
           thread_start.cc \
           trace_session_component.cc
 
-INC_DIR += $(REP_DIR)/src/core/include \
-           $(GEN_CORE_DIR)/include \
-           $(REP_DIR)/src/base/console \
-           $(BASE_DIR)/src/base/thread \
-           $(BASE_DIR)/src/lib/startup
+INC_DIR += $(REP_DIR)/src/core/include $(GEN_CORE_DIR)/include \
+           $(REP_DIR)/src/include      $(BASE_DIR)/src/include
 
 include $(GEN_CORE_DIR)/version.inc
 
diff --git a/repos/base-okl4/src/base/console/core_console.h b/repos/base-okl4/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-okl4/src/base/console/core_console.h
rename to repos/base-okl4/src/include/base/internal/core_console.h
diff --git a/repos/base-okl4/src/base/lock/lock_helper.h b/repos/base-okl4/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-okl4/src/base/lock/lock_helper.h
rename to repos/base-okl4/src/include/base/internal/lock_helper.h
diff --git a/repos/base-okl4/src/base/bootinfo/stdint.h b/repos/base-okl4/src/include/bootinfo/internal/stdint.h
similarity index 100%
rename from repos/base-okl4/src/base/bootinfo/stdint.h
rename to repos/base-okl4/src/include/bootinfo/internal/stdint.h
diff --git a/repos/base-okl4/src/base/bootinfo/stdio.h b/repos/base-okl4/src/include/bootinfo/internal/stdio.h
similarity index 100%
rename from repos/base-okl4/src/base/bootinfo/stdio.h
rename to repos/base-okl4/src/include/bootinfo/internal/stdio.h
diff --git a/repos/base-pistachio/lib/mk/base-common.mk b/repos/base-pistachio/lib/mk/base-common.mk
index b21f8b4c3..ab9809275 100644
--- a/repos/base-pistachio/lib/mk/base-common.mk
+++ b/repos/base-pistachio/lib/mk/base-common.mk
@@ -24,9 +24,7 @@ SRC_CC += thread/myself.cc
 SRC_CC += thread/context_allocator.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath cap_copy.cc $(BASE_DIR)/src/lib/startup
 vpath %.cc        $(REP_DIR)/src/base
diff --git a/repos/base-pistachio/lib/mk/base.mk b/repos/base-pistachio/lib/mk/base.mk
index 5e7bdf98c..6510601ba 100644
--- a/repos/base-pistachio/lib/mk/base.mk
+++ b/repos/base-pistachio/lib/mk/base.mk
@@ -13,7 +13,7 @@ SRC_CC += thread/thread_start.cc
 SRC_CC += irq/platform.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-pistachio/src/core/cpu_session_platform.cc b/repos/base-pistachio/src/core/cpu_session_platform.cc
index 727e5088c..8d2f12c78 100644
--- a/repos/base-pistachio/src/core/cpu_session_platform.cc
+++ b/repos/base-pistachio/src/core/cpu_session_platform.cc
@@ -13,19 +13,10 @@
 
 /* Genode includes */
 #include <cpu_session_component.h>
-#include <pistachio/kip.h>
 
 using namespace Genode;
 using namespace Pistachio;
 
-// unsigned int Cpu_session_component::available_cpus()
-// {
-//   if (_pinned_cpu == -1)
-//     return L4_NumProcessors(get_kip());
-//   else
-//     return 1;
-// }
-
 Ram_dataspace_capability Cpu_session_component::utcb(Thread_capability thread_cap)
 {
 	PERR("%s: Not implemented", __PRETTY_FUNCTION__);
diff --git a/repos/base-pistachio/src/core/include/ipc_pager.h b/repos/base-pistachio/src/core/include/ipc_pager.h
index 36cc7e7a1..599dbaa71 100644
--- a/repos/base-pistachio/src/core/include/ipc_pager.h
+++ b/repos/base-pistachio/src/core/include/ipc_pager.h
@@ -20,7 +20,9 @@
 #include <base/ipc.h>
 #include <base/stdint.h>
 #include <util/touch.h>
-#include <pistachio/kip.h>
+
+/* core-local includes */
+#include <kip.h>
 
 /* Pistachio includes */
 namespace Pistachio {
diff --git a/repos/base-pistachio/include/pistachio/kip.h b/repos/base-pistachio/src/core/include/kip.h
similarity index 100%
rename from repos/base-pistachio/include/pistachio/kip.h
rename to repos/base-pistachio/src/core/include/kip.h
diff --git a/repos/base-pistachio/include/pistachio/thread_helper.h b/repos/base-pistachio/src/core/include/print_l4_thread_id.h
similarity index 75%
rename from repos/base-pistachio/include/pistachio/thread_helper.h
rename to repos/base-pistachio/src/core/include/print_l4_thread_id.h
index d67f42b3e..0d941192b 100644
--- a/repos/base-pistachio/include/pistachio/thread_helper.h
+++ b/repos/base-pistachio/src/core/include/print_l4_thread_id.h
@@ -1,5 +1,5 @@
 /*
- * \brief  Pistachio-specific thread helper functions
+ * \brief  Pistachio-specific thread helper
  * \author Julian Stecklina
  * \date   2008-02-20
  */
@@ -11,16 +11,15 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#ifndef _INCLUDE__PISTACHIO__THREAD_HELPER_H_
-#define _INCLUDE__PISTACHIO__THREAD_HELPER_H_
+#ifndef _INCLUDE__PISTACHIO__PRINT_L4_THREAD_ID_
+#define _INCLUDE__PISTACHIO__PRINT_L4_THREAD_ID_
 
 #include <base/printf.h>
 
-namespace Pistachio
-{
+namespace Pistachio {
 #include <l4/types.h>
 
-	inline void print_l4_threadid(L4_ThreadId_t t)
+	inline void print_l4_thread_id(L4_ThreadId_t t)
 	{
 		if (L4_IsLocalId(t)) {
 			Genode::printf("THREAD (local) %02lx (raw %08lx)\n",
@@ -42,4 +41,4 @@ namespace Pistachio
 	}
 }
 
-#endif /* _INCLUDE__PISTACHIO__THREAD_HELPER_H_ */
+#endif /* _INCLUDE__PISTACHIO__PRINT_L4_THREAD_ID_ */
diff --git a/repos/base-pistachio/src/core/include/util.h b/repos/base-pistachio/src/core/include/util.h
index 6ec49c997..9c2f1107d 100644
--- a/repos/base-pistachio/src/core/include/util.h
+++ b/repos/base-pistachio/src/core/include/util.h
@@ -19,9 +19,11 @@
 #include <base/printf.h>
 #include <rm_session/rm_session.h>
 #include <util/touch.h>
-#include <pistachio/kip.h>
 #include <base/native_types.h>
 
+/* core-local includes */
+#include <kip.h>
+
 /* Pistachio includes */
 namespace Pistachio {
 #include <l4/types.h>
diff --git a/repos/base-pistachio/src/core/io_mem_session_support.cc b/repos/base-pistachio/src/core/io_mem_session_support.cc
index 4e136a1f1..9ed3ee689 100644
--- a/repos/base-pistachio/src/core/io_mem_session_support.cc
+++ b/repos/base-pistachio/src/core/io_mem_session_support.cc
@@ -13,10 +13,10 @@
  */
 
 /* core includes */
-#include <pistachio/kip.h>
 #include <platform.h>
 #include <util.h>
 #include <io_mem_session_component.h>
+#include <kip.h>
 
 /* Pistachio includes */
 namespace Pistachio {
diff --git a/repos/base-pistachio/src/base/kip/kip.cc b/repos/base-pistachio/src/core/kip.cc
similarity index 95%
rename from repos/base-pistachio/src/base/kip/kip.cc
rename to repos/base-pistachio/src/core/kip.cc
index 04c4db794..61a580a68 100644
--- a/repos/base-pistachio/src/base/kip/kip.cc
+++ b/repos/base-pistachio/src/core/kip.cc
@@ -11,7 +11,8 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#include <pistachio/kip.h>
+/* core-local includes */
+#include <kip.h>
 
 using namespace Pistachio;
 
diff --git a/repos/base-pistachio/src/core/multiboot_info.cc b/repos/base-pistachio/src/core/multiboot_info.cc
index a30bcb382..b95d9dd6d 100644
--- a/repos/base-pistachio/src/core/multiboot_info.cc
+++ b/repos/base-pistachio/src/core/multiboot_info.cc
@@ -15,10 +15,10 @@
 #include <base/printf.h>
 #include <multiboot.h>
 #include <util/misc_math.h>
-#include <pistachio/kip.h>
 
 /* core includes */
 #include <util.h>
+#include <kip.h>
 
 /* Pistachio includes */
 namespace Pistachio {
diff --git a/repos/base-pistachio/src/core/platform.cc b/repos/base-pistachio/src/core/platform.cc
index b11650042..efd073d1e 100644
--- a/repos/base-pistachio/src/core/platform.cc
+++ b/repos/base-pistachio/src/core/platform.cc
@@ -26,8 +26,8 @@
 #include <platform_thread.h>
 #include <platform_pd.h>
 #include <util.h>
-#include <pistachio/thread_helper.h>
-#include <pistachio/kip.h>
+#include <kip.h>
+#include <print_l4_thread_id.h>
 
 /* Pistachio includes */
 namespace Pistachio {
@@ -161,13 +161,13 @@ static void _core_pager_loop()
 
 		PDBG("Got page fault (pf_addr = %08lx, pf_ip = %08lx, flags = %08lx).",
 		     pf_addr, pf_ip, flags);
-		print_l4_threadid(L4_GlobalId(t));
+		print_l4_thread_id(L4_GlobalId(t));
 
 		/* check for NULL pointer */
 		if (pf_addr < page_size) {
 			PERR("possible null pointer %s at address %lx at EIP %lx in",
 			     is_write_fault(flags) ? "WRITE" : "READ/EXEC", pf_addr, pf_ip);
-			print_l4_threadid(t);
+			print_l4_thread_id(t);
 			/* do not unblock faulter */
 			break;
 		} else if (!_core_address_ranges().valid_addr(pf_addr)) {
@@ -175,12 +175,12 @@ static void _core_pager_loop()
 
 			PERR("%s access outside of RAM at %lx IP %lx",
 			     is_write_fault(flags) ? "WRITE" : "READ", pf_addr, pf_ip);
-			print_l4_threadid(t);
+			print_l4_thread_id(t);
 			/* do not unblock faulter */
 			break;
 		} else if (verbose_core_pf) {
 			PDBG("pfa=%lx ip=%lx in", pf_addr, pf_ip);
-			print_l4_threadid(t);
+			print_l4_thread_id(t);
 		}
 
 		/* my pf handler is sigma0 - just touch the appropriate page */
diff --git a/repos/base-pistachio/src/core/platform_thread.cc b/repos/base-pistachio/src/core/platform_thread.cc
index e0b75699b..aacb4f686 100644
--- a/repos/base-pistachio/src/core/platform_thread.cc
+++ b/repos/base-pistachio/src/core/platform_thread.cc
@@ -14,12 +14,11 @@
 /* Genode includes */
 #include <base/printf.h>
 #include <util/string.h>
-#include <pistachio/thread_helper.h>
-#include <pistachio/kip.h>
 
 /* core includes */
 #include <platform_pd.h>
 #include <platform_thread.h>
+#include <kip.h>
 
 /* Pistachio includes */
 namespace Pistachio
diff --git a/repos/base-pistachio/src/core/spec/x86/platform_x86.cc b/repos/base-pistachio/src/core/spec/x86/platform_x86.cc
index c3fd845d7..9285edd37 100644
--- a/repos/base-pistachio/src/core/spec/x86/platform_x86.cc
+++ b/repos/base-pistachio/src/core/spec/x86/platform_x86.cc
@@ -1,7 +1,7 @@
 /*
  * \brief  Platform support specific to x86
  * \author Christian Helmuth
- * \date    2006-04-11
+ * \date   2006-04-11
  */
 
 /*
@@ -11,8 +11,8 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#include <pistachio/thread_helper.h>
-#include <pistachio/kip.h>
+/* core-local includes */
+#include <kip.h>
 
 #include "platform.h"
 #include "util.h"
diff --git a/repos/base-pistachio/src/core/target.inc b/repos/base-pistachio/src/core/target.inc
index d6f018e3b..0b40236e6 100644
--- a/repos/base-pistachio/src/core/target.inc
+++ b/repos/base-pistachio/src/core/target.inc
@@ -37,10 +37,8 @@ SRC_CC       = context_area.cc \
                thread_start.cc \
                trace_session_component.cc
 
-INC_DIR     += $(REP_DIR)/src/core/include \
-               $(REP_DIR)/src/base/console \
-               $(BASE_DIR)/src/base/thread \
-               $(GEN_CORE_DIR)/include
+INC_DIR     += $(REP_DIR)/src/core/include $(GEN_CORE_DIR)/include \
+               $(REP_DIR)/src/include      $(BASE_DIR)/src/include
 
 include $(GEN_CORE_DIR)/version.inc
 
diff --git a/repos/base-pistachio/src/base/console/core_console.h b/repos/base-pistachio/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-pistachio/src/base/console/core_console.h
rename to repos/base-pistachio/src/include/base/internal/core_console.h
diff --git a/repos/base-pistachio/src/base/lock/lock_helper.h b/repos/base-pistachio/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-pistachio/src/base/lock/lock_helper.h
rename to repos/base-pistachio/src/include/base/internal/lock_helper.h
diff --git a/repos/base-sel4/lib/mk/base-common.inc b/repos/base-sel4/lib/mk/base-common.inc
index 552eaff36..3a6856d6e 100644
--- a/repos/base-sel4/lib/mk/base-common.inc
+++ b/repos/base-sel4/lib/mk/base-common.inc
@@ -26,9 +26,7 @@ SRC_CC += thread/thread_bootstrap.cc
 SRC_CC += env/capability.cc
 SRC_CC += sleep.cc
 
-INC_DIR +=  $(REP_DIR)/src/base
-INC_DIR +=  $(REP_DIR)/src/base/lock
-INC_DIR += $(BASE_DIR)/src/base/thread
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-sel4/lib/mk/base.mk b/repos/base-sel4/lib/mk/base.mk
index 9c2acb3a6..3e7838fab 100644
--- a/repos/base-sel4/lib/mk/base.mk
+++ b/repos/base-sel4/lib/mk/base.mk
@@ -13,8 +13,7 @@ SRC_CC += thread/thread_start.cc thread/thread_init.cc
 SRC_CC += irq/platform.cc
 SRC_CC += server/rpc_cap_alloc.cc
 
-INC_DIR +=  $(REP_DIR)/src/base
-INC_DIR += $(BASE_DIR)/src/base/env
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 vpath %.cc  $(REP_DIR)/src/base
 vpath %.cc $(BASE_DIR)/src/base
diff --git a/repos/base-sel4/lib/mk/core.mk b/repos/base-sel4/lib/mk/core.mk
index 761c61153..6801ce336 100644
--- a/repos/base-sel4/lib/mk/core.mk
+++ b/repos/base-sel4/lib/mk/core.mk
@@ -37,10 +37,8 @@ SRC_CC      += \
 
 LIBS        += core_printf base-common syscall
 
-INC_DIR     += $(REP_DIR)/src/core/include \
-               $(GEN_CORE_DIR)/include \
-               $(REP_DIR)/src/base \
-               $(BASE_DIR)/src/base/thread
+INC_DIR     += $(REP_DIR)/src/core/include $(GEN_CORE_DIR)/include \
+               $(REP_DIR)/src/include      $(BASE_DIR)/src/include
 
 include $(GEN_CORE_DIR)/version.inc
 
diff --git a/repos/base-sel4/lib/mk/core_printf.mk b/repos/base-sel4/lib/mk/core_printf.mk
index ebeadf7b1..d5303f861 100644
--- a/repos/base-sel4/lib/mk/core_printf.mk
+++ b/repos/base-sel4/lib/mk/core_printf.mk
@@ -1,5 +1,5 @@
 SRC_CC   = core_printf.cc
-INC_DIR += $(REP_DIR)/src/base/console
+INC_DIR += $(REP_DIR)/src/include
 LIBS    += syscall
 
 vpath core_printf.cc $(BASE_DIR)/src/base/console
diff --git a/repos/base-sel4/lib/mk/spec/x86_32/startup.mk b/repos/base-sel4/lib/mk/spec/x86_32/startup.mk
index fe0a8cf97..5b76cbfba 100644
--- a/repos/base-sel4/lib/mk/spec/x86_32/startup.mk
+++ b/repos/base-sel4/lib/mk/spec/x86_32/startup.mk
@@ -1,9 +1,9 @@
 #
-# Make the includes of src/base/internal/ available to the startup lib. This is
+# Make the includes of src/base/include/ available to the startup lib. This is
 # needed because the seL4-specific src/platform/_main_parent_cap.h as included
-# by the startup lib depends on the internal/capability_space_sel4.h.
+# by the startup lib depends on base/internal/capability_space_sel4.h.
 #
-INC_DIR += $(REP_DIR)/src/base
+INC_DIR += $(REP_DIR)/src/include $(BASE_DIR)/src/include
 
 include $(BASE_DIR)/lib/mk/startup.inc
 
diff --git a/repos/base-sel4/src/base/env/capability.cc b/repos/base-sel4/src/base/env/capability.cc
index 3ac3da919..6c9093f12 100644
--- a/repos/base-sel4/src/base/env/capability.cc
+++ b/repos/base-sel4/src/base/env/capability.cc
@@ -15,8 +15,8 @@
 #include <base/printf.h>
 
 /* base-internal includes */
-#include <internal/native_types.h>
-#include <internal/capability_space.h>
+#include <base/internal/native_types.h>
+#include <base/internal/capability_space.h>
 
 using namespace Genode;
 
diff --git a/repos/base-sel4/src/base/env/capability_space.cc b/repos/base-sel4/src/base/env/capability_space.cc
index 8f967b5fb..4e5d60e44 100644
--- a/repos/base-sel4/src/base/env/capability_space.cc
+++ b/repos/base-sel4/src/base/env/capability_space.cc
@@ -16,8 +16,8 @@
 #include <base/printf.h>
 
 /* base-internal includes */
-#include <internal/capability_data.h>
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_data.h>
+#include <base/internal/capability_space_sel4.h>
 
 /**
  * Definition of capability meta data
diff --git a/repos/base-sel4/src/base/ipc/ipc.cc b/repos/base-sel4/src/base/ipc/ipc.cc
index 4a77585b9..91f3999b9 100644
--- a/repos/base-sel4/src/base/ipc/ipc.cc
+++ b/repos/base-sel4/src/base/ipc/ipc.cc
@@ -19,8 +19,8 @@
 #include <util/misc_math.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
-#include <internal/kernel_debugger.h>
+#include <base/internal/capability_space_sel4.h>
+#include <base/internal/kernel_debugger.h>
 
 /* seL4 includes */
 #include <sel4/sel4.h>
diff --git a/repos/base-sel4/src/base/server/server.cc b/repos/base-sel4/src/base/server/server.cc
index 26ffa031b..371f923e1 100644
--- a/repos/base-sel4/src/base/server/server.cc
+++ b/repos/base-sel4/src/base/server/server.cc
@@ -17,9 +17,11 @@
  */
 
 /* Genode includes */
-#include <internal/capability_space_sel4.h>
 #include <base/rpc_server.h>
 
+/* base-internal includes */
+#include <base/internal/capability_space_sel4.h>
+
 using namespace Genode;
 
 
diff --git a/repos/base-sel4/src/core/capability_space.cc b/repos/base-sel4/src/core/capability_space.cc
index 8595e39d3..79fd322be 100644
--- a/repos/base-sel4/src/core/capability_space.cc
+++ b/repos/base-sel4/src/core/capability_space.cc
@@ -16,8 +16,8 @@
 #include <base/printf.h>
 
 /* base-internal includes */
-#include <internal/capability_data.h>
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_data.h>
+#include <base/internal/capability_space_sel4.h>
 
 /* core includes */
 #include <core_capability_space.h>
diff --git a/repos/base-sel4/src/core/include/cap_sel_alloc.h b/repos/base-sel4/src/core/include/cap_sel_alloc.h
index 5305bc953..28e12d6d4 100644
--- a/repos/base-sel4/src/core/include/cap_sel_alloc.h
+++ b/repos/base-sel4/src/core/include/cap_sel_alloc.h
@@ -18,7 +18,7 @@
 #include <base/exception.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 namespace Genode { struct Cap_sel_alloc; }
 
diff --git a/repos/base-sel4/src/core/include/core_capability_data.h b/repos/base-sel4/src/core/include/core_capability_data.h
index a82f4b9e7..f4d0835dc 100644
--- a/repos/base-sel4/src/core/include/core_capability_data.h
+++ b/repos/base-sel4/src/core/include/core_capability_data.h
@@ -15,7 +15,7 @@
 #define _CORE__INCLUDE__CAPABILITY_CORE_DATA_H_
 
 /* base-internal includes */
-#include <internal/capability_data.h>
+#include <base/internal/capability_data.h>
 
 namespace Genode {
 
diff --git a/repos/base-sel4/src/core/include/core_capability_space.h b/repos/base-sel4/src/core/include/core_capability_space.h
index a630aa22a..0eb5db185 100644
--- a/repos/base-sel4/src/core/include/core_capability_space.h
+++ b/repos/base-sel4/src/core/include/core_capability_space.h
@@ -15,7 +15,7 @@
 #define _CORE__INCLUDE__CORE_CAPABILITY_SPACE_H_
 
 /* base-internal includes */
-#include <internal/rpc_obj_key.h>
+#include <base/internal/rpc_obj_key.h>
 
 namespace Genode { class Pd_session; }
 
diff --git a/repos/base-sel4/src/core/include/platform_pd.h b/repos/base-sel4/src/core/include/platform_pd.h
index 331d3c79e..eca19553f 100644
--- a/repos/base-sel4/src/core/include/platform_pd.h
+++ b/repos/base-sel4/src/core/include/platform_pd.h
@@ -23,7 +23,7 @@
 #include <vm_space.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 namespace Genode { class Platform_pd; }
 
diff --git a/repos/base-sel4/src/core/include/thread_sel4.h b/repos/base-sel4/src/core/include/thread_sel4.h
index 5bb3c20c2..bb6852c87 100644
--- a/repos/base-sel4/src/core/include/thread_sel4.h
+++ b/repos/base-sel4/src/core/include/thread_sel4.h
@@ -21,7 +21,7 @@
 #include <base/printf.h>
 
 /* base-internal includes */
-#include <internal/assert.h>
+#include <base/internal/assert.h>
 
 /* core includes */
 #include <map_local.h>
diff --git a/repos/base-sel4/src/core/pager.cc b/repos/base-sel4/src/core/pager.cc
index a19ff87c9..3603d1460 100644
--- a/repos/base-sel4/src/core/pager.cc
+++ b/repos/base-sel4/src/core/pager.cc
@@ -20,7 +20,7 @@
 #include <install_mapping.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 /* seL4 includes */
 #include <sel4/sel4.h>
diff --git a/repos/base-sel4/src/core/platform_pd.cc b/repos/base-sel4/src/core/platform_pd.cc
index 13af582b2..3108e6b9c 100644
--- a/repos/base-sel4/src/core/platform_pd.cc
+++ b/repos/base-sel4/src/core/platform_pd.cc
@@ -22,7 +22,7 @@
 #include <kernel_object.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 using namespace Genode;
 
diff --git a/repos/base-sel4/src/core/platform_thread.cc b/repos/base-sel4/src/core/platform_thread.cc
index 98c2cd037..acf2f81fc 100644
--- a/repos/base-sel4/src/core/platform_thread.cc
+++ b/repos/base-sel4/src/core/platform_thread.cc
@@ -20,7 +20,7 @@
 #include <platform_pd.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 using namespace Genode;
 
diff --git a/repos/base-sel4/src/base/internal/assert.h b/repos/base-sel4/src/include/base/internal/assert.h
similarity index 95%
rename from repos/base-sel4/src/base/internal/assert.h
rename to repos/base-sel4/src/include/base/internal/assert.h
index 9a1bebf68..6488f6f19 100644
--- a/repos/base-sel4/src/base/internal/assert.h
+++ b/repos/base-sel4/src/include/base/internal/assert.h
@@ -21,7 +21,7 @@
 #include <base/snprintf.h>
 
 /* base-internal includes */
-#include <internal/kernel_debugger.h>
+#include <base/internal/kernel_debugger.h>
 
 #define ASSERT(e) \
 	do { if (!(e)) { \
diff --git a/repos/base-sel4/src/base/internal/capability_data.h b/repos/base-sel4/src/include/base/internal/capability_data.h
similarity index 96%
rename from repos/base-sel4/src/base/internal/capability_data.h
rename to repos/base-sel4/src/include/base/internal/capability_data.h
index 2d27f238f..1ad9f4e46 100644
--- a/repos/base-sel4/src/base/internal/capability_data.h
+++ b/repos/base-sel4/src/include/base/internal/capability_data.h
@@ -19,7 +19,7 @@
 #include <util/avl_tree.h>
 
 /* base-internal includes */
-#include <internal/rpc_obj_key.h>
+#include <base/internal/rpc_obj_key.h>
 
 namespace Genode { class Capability_data; }
 
diff --git a/repos/base-sel4/src/base/internal/capability_space.h b/repos/base-sel4/src/include/base/internal/capability_space.h
similarity index 96%
rename from repos/base-sel4/src/base/internal/capability_space.h
rename to repos/base-sel4/src/include/base/internal/capability_space.h
index 55feaa4ea..98518e9d3 100644
--- a/repos/base-sel4/src/base/internal/capability_space.h
+++ b/repos/base-sel4/src/include/base/internal/capability_space.h
@@ -23,7 +23,7 @@
 #include <base/thread.h>
 
 /* base-internal includes */
-#include <internal/capability_data.h>
+#include <base/internal/capability_data.h>
 
 
 namespace Genode { namespace Capability_space {
diff --git a/repos/base-sel4/src/base/internal/capability_space_sel4.h b/repos/base-sel4/src/include/base/internal/capability_space_sel4.h
similarity index 98%
rename from repos/base-sel4/src/base/internal/capability_space_sel4.h
rename to repos/base-sel4/src/include/base/internal/capability_space_sel4.h
index 793c05a57..098b046fa 100644
--- a/repos/base-sel4/src/base/internal/capability_space_sel4.h
+++ b/repos/base-sel4/src/include/base/internal/capability_space_sel4.h
@@ -19,8 +19,8 @@
 #include <base/lock.h>
 
 /* base-internal includes */
-#include <internal/capability_space.h>
-#include <internal/assert.h>
+#include <base/internal/capability_space.h>
+#include <base/internal/assert.h>
 
 namespace Genode {
 	
diff --git a/repos/base-sel4/src/base/console/core_console.h b/repos/base-sel4/src/include/base/internal/core_console.h
similarity index 100%
rename from repos/base-sel4/src/base/console/core_console.h
rename to repos/base-sel4/src/include/base/internal/core_console.h
diff --git a/repos/base-sel4/src/base/internal/kernel_debugger.h b/repos/base-sel4/src/include/base/internal/kernel_debugger.h
similarity index 100%
rename from repos/base-sel4/src/base/internal/kernel_debugger.h
rename to repos/base-sel4/src/include/base/internal/kernel_debugger.h
diff --git a/repos/base-sel4/src/base/lock/lock_helper.h b/repos/base-sel4/src/include/base/internal/lock_helper.h
similarity index 100%
rename from repos/base-sel4/src/base/lock/lock_helper.h
rename to repos/base-sel4/src/include/base/internal/lock_helper.h
diff --git a/repos/base-sel4/src/base/internal/native_types.h b/repos/base-sel4/src/include/base/internal/native_types.h
similarity index 100%
rename from repos/base-sel4/src/base/internal/native_types.h
rename to repos/base-sel4/src/include/base/internal/native_types.h
diff --git a/repos/base-sel4/src/base/internal/rpc_obj_key.h b/repos/base-sel4/src/include/base/internal/rpc_obj_key.h
similarity index 100%
rename from repos/base-sel4/src/base/internal/rpc_obj_key.h
rename to repos/base-sel4/src/include/base/internal/rpc_obj_key.h
diff --git a/repos/base-sel4/src/lib/startup/_main_parent_cap.h b/repos/base-sel4/src/include/startup/internal/_main_parent_cap.h
similarity index 94%
rename from repos/base-sel4/src/lib/startup/_main_parent_cap.h
rename to repos/base-sel4/src/include/startup/internal/_main_parent_cap.h
index 72d031d44..5bc0bd6cd 100644
--- a/repos/base-sel4/src/lib/startup/_main_parent_cap.h
+++ b/repos/base-sel4/src/include/startup/internal/_main_parent_cap.h
@@ -18,7 +18,7 @@
 #include <util/string.h>
 
 /* base-internal includes */
-#include <internal/capability_space_sel4.h>
+#include <base/internal/capability_space_sel4.h>
 
 namespace Genode {
 
diff --git a/repos/base/include/spec/x86/bios_data_area.h b/repos/base/include/spec/x86/bios_data_area.h
index 109f67f37..7c2561a01 100644
--- a/repos/base/include/spec/x86/bios_data_area.h
+++ b/repos/base/include/spec/x86/bios_data_area.h
@@ -17,8 +17,8 @@
 /* Genode includes */
 #include <util/mmio.h>
 
-/* base includes */
-#include <unmanaged_singleton.h>
+/* base-internal includes */
+#include <base/internal/unmanaged_singleton.h>
 
 namespace Genode { class Bios_data_area; }
 
diff --git a/repos/base/lib/mk/startup.inc b/repos/base/lib/mk/startup.inc
index 828ff7496..42fe29824 100644
--- a/repos/base/lib/mk/startup.inc
+++ b/repos/base/lib/mk/startup.inc
@@ -1,6 +1,6 @@
 SRC_S       += crt0.s
 SRC_CC      += _main.cc init_main_thread.cc
-REP_INC_DIR += src/lib/startup
+REP_INC_DIR += src/include
 LIBS        += syscall
 
 vpath %.cc $(BASE_DIR)/src/lib/startup
diff --git a/repos/base/src/base/console/core_printf.cc b/repos/base/src/base/console/core_printf.cc
index 1c12370f1..b0ec88f7e 100644
--- a/repos/base/src/base/console/core_printf.cc
+++ b/repos/base/src/base/console/core_printf.cc
@@ -20,10 +20,13 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#include <core_console.h>  /* provides 'Core_console' */
+/* Genode includes */
 #include <base/printf.h>
 #include <base/lock.h>
 
+/* base-internal includes */
+#include <base/internal/core_console.h>
+
 using namespace Genode;
 
 
diff --git a/repos/base/src/base/elf/elf_binary.cc b/repos/base/src/base/elf/elf_binary.cc
index f96e01109..50e77d829 100644
--- a/repos/base/src/base/elf/elf_binary.cc
+++ b/repos/base/src/base/elf/elf_binary.cc
@@ -18,8 +18,8 @@
 #include <base/elf.h>
 #include <util/string.h>
 
-/* local includes */
-#include "elf.h"
+/* base-internal includes */
+#include <base/internal/elf_format.h>
 
 using namespace Genode;
 
diff --git a/repos/base/src/base/env/context_area.cc b/repos/base/src/base/env/context_area.cc
index aa60debc4..c4047b3fc 100644
--- a/repos/base/src/base/env/context_area.cc
+++ b/repos/base/src/base/env/context_area.cc
@@ -11,10 +11,11 @@
  * under the terms of the GNU General Public License version 2.
  */
 
+/* Genode includes */
 #include <rm_session/connection.h>
-#include <base/env.h>
-#include <base/thread.h>
-#include <platform_env_common.h>
+
+/* base-internal includes */
+#include <base/internal/platform_env_common.h>
 
 using namespace Genode;
 
diff --git a/repos/base/src/base/env/env.cc b/repos/base/src/base/env/env.cc
index 5554b140a..a9b5d0da3 100644
--- a/repos/base/src/base/env/env.cc
+++ b/repos/base/src/base/env/env.cc
@@ -12,7 +12,7 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-#include <platform_env.h>
+#include <base/internal/platform_env.h>
 
 namespace Genode {
 
diff --git a/repos/base/src/base/env/reinitialize.cc b/repos/base/src/base/env/reinitialize.cc
index d274c863f..e264be794 100644
--- a/repos/base/src/base/env/reinitialize.cc
+++ b/repos/base/src/base/env/reinitialize.cc
@@ -12,8 +12,8 @@
  * under the terms of the GNU General Public License version 2.
  */
 
-/* env includes */
-#include <platform_env.h>
+/* base-internal includes */
+#include <base/internal/platform_env.h>
 
 /* Genode includes */
 #include <util/construct_at.h>
diff --git a/repos/base/src/base/lock/lock.cc b/repos/base/src/base/lock/lock.cc
index 5b6c3e080..bd3d500df 100644
--- a/repos/base/src/base/lock/lock.cc
+++ b/repos/base/src/base/lock/lock.cc
@@ -15,8 +15,8 @@
 #include <base/cancelable_lock.h>
 #include <cpu/memory_barrier.h>
 
-/* local includes */
-#include <spin_lock.h>
+/* base-internal includes */
+#include <base/internal/spin_lock.h>
 
 using namespace Genode;
 
diff --git a/repos/base/src/base/thread/trace.cc b/repos/base/src/base/thread/trace.cc
index d5786ae43..25d7b864d 100644
--- a/repos/base/src/base/thread/trace.cc
+++ b/repos/base/src/base/thread/trace.cc
@@ -19,7 +19,7 @@
 #include <util/construct_at.h>
 
 /* local includes */
-#include <trace/control.h>
+#include <base/internal/trace_control.h>
 
 using namespace Genode;
 
diff --git a/repos/base/src/core/include/trace/control_area.h b/repos/base/src/core/include/trace/control_area.h
index a0ab6b37b..4d6b048e4 100644
--- a/repos/base/src/core/include/trace/control_area.h
+++ b/repos/base/src/core/include/trace/control_area.h
@@ -18,7 +18,7 @@
 #include <dataspace/capability.h>
 
 /* base-internal includes */
-#include <trace/control.h>
+#include <base/internal/trace_control.h>
 
 namespace Genode { namespace Trace { class Control_area; } }
 
diff --git a/repos/base/src/core/include/trace/source_registry.h b/repos/base/src/core/include/trace/source_registry.h
index d503969fc..49e219ae8 100644
--- a/repos/base/src/core/include/trace/source_registry.h
+++ b/repos/base/src/core/include/trace/source_registry.h
@@ -21,7 +21,7 @@
 #include <base/weak_ptr.h>
 
 /* base-internal include */
-#include <trace/control.h>
+#include <base/internal/trace_control.h>
 
 namespace Genode { namespace Trace {
 	class Source;
diff --git a/repos/base/src/core/include/trace/subject_registry.h b/repos/base/src/core/include/trace/subject_registry.h
index caafcb27f..ad063690a 100644
--- a/repos/base/src/core/include/trace/subject_registry.h
+++ b/repos/base/src/core/include/trace/subject_registry.h
@@ -32,7 +32,7 @@
 #include <trace/source_registry.h>
 
 /* base-internal include */
-#include <trace/control.h>
+#include <base/internal/trace_control.h>
 
 namespace Genode { namespace Trace {
 	class Subject;
diff --git a/repos/base/src/base/elf/elf.h b/repos/base/src/include/base/internal/elf_format.h
similarity index 100%
rename from repos/base/src/base/elf/elf.h
rename to repos/base/src/include/base/internal/elf_format.h
diff --git a/repos/base/src/base/env/platform_env.h b/repos/base/src/include/base/internal/platform_env.h
similarity index 98%
rename from repos/base/src/base/env/platform_env.h
rename to repos/base/src/include/base/internal/platform_env.h
index 58192ffd5..235445624 100644
--- a/repos/base/src/base/env/platform_env.h
+++ b/repos/base/src/include/base/internal/platform_env.h
@@ -25,8 +25,8 @@
 #include <base/env.h>
 #include <base/heap.h>
 
-/* local includes */
-#include <platform_env_common.h>
+/* base-internal includes */
+#include <base/internal/platform_env_common.h>
 
 
 namespace Genode {
diff --git a/repos/base/src/base/env/platform_env_common.h b/repos/base/src/include/base/internal/platform_env_common.h
similarity index 100%
rename from repos/base/src/base/env/platform_env_common.h
rename to repos/base/src/include/base/internal/platform_env_common.h
diff --git a/repos/base/src/base/lock/spin_lock.h b/repos/base/src/include/base/internal/spin_lock.h
similarity index 94%
rename from repos/base/src/base/lock/spin_lock.h
rename to repos/base/src/include/base/internal/spin_lock.h
index ff1cbf793..17e25499e 100644
--- a/repos/base/src/base/lock/spin_lock.h
+++ b/repos/base/src/include/base/internal/spin_lock.h
@@ -19,8 +19,8 @@
 #include <cpu/atomic.h>
 #include <cpu/memory_barrier.h>
 
-/* local includes */
-#include <lock_helper.h>
+/* base-internal includes */
+#include <base/internal/lock_helper.h>
 
 /*
  * Spinlock functions used for protecting the critical sections within the
diff --git a/repos/base/src/base/thread/trace/control.h b/repos/base/src/include/base/internal/trace_control.h
similarity index 100%
rename from repos/base/src/base/thread/trace/control.h
rename to repos/base/src/include/base/internal/trace_control.h
diff --git a/repos/base/src/base/include/unmanaged_singleton.h b/repos/base/src/include/base/internal/unmanaged_singleton.h
similarity index 100%
rename from repos/base/src/base/include/unmanaged_singleton.h
rename to repos/base/src/include/base/internal/unmanaged_singleton.h
diff --git a/repos/base/src/lib/startup/_main_parent_cap.h b/repos/base/src/include/startup/internal/_main_parent_cap.h
similarity index 100%
rename from repos/base/src/lib/startup/_main_parent_cap.h
rename to repos/base/src/include/startup/internal/_main_parent_cap.h
diff --git a/repos/base/src/lib/startup/_main.cc b/repos/base/src/lib/startup/_main.cc
index ddd068c3b..1d04ab108 100644
--- a/repos/base/src/lib/startup/_main.cc
+++ b/repos/base/src/lib/startup/_main.cc
@@ -25,7 +25,7 @@
 #include <base/printf.h>
 
 /* platform-specific local helper functions */
-#include <_main_parent_cap.h>
+#include <startup/internal/_main_parent_cap.h>
 
 
 using namespace Genode;
diff --git a/repos/ports-foc/lib/mk/l4lx.mk b/repos/ports-foc/lib/mk/l4lx.mk
index ea9a52f0e..7bb422c4a 100644
--- a/repos/ports-foc/lib/mk/l4lx.mk
+++ b/repos/ports-foc/lib/mk/l4lx.mk
@@ -33,6 +33,9 @@ SRC_CC  += env.cc \
 INC_DIR += $(REP_DIR)/include \
            $(REP_DIR)/src/lib/l4lx/include \
 
+# for reusing the 'Expanding_rm_session' from the platform env in dataspace.h
+INC_DIR += $(BASE_DIR)/src/include
+
 LIBS     = base config
 
 vpath %.cc $(REP_DIR)/src/lib/l4lx
diff --git a/repos/ports-foc/src/lib/l4lx/startup.cc b/repos/ports-foc/src/lib/l4lx/startup.cc
index f7f72ff50..b1b429ab7 100644
--- a/repos/ports-foc/src/lib/l4lx/startup.cc
+++ b/repos/ports-foc/src/lib/l4lx/startup.cc
@@ -12,7 +12,6 @@
  */
 
 /* Genode includes */
-#include <base/elf.h>
 #include <base/env.h>
 #include <base/thread.h>
 #include <base/native_types.h>