+++ a/kernel/Mk/Makeconf
@@ -172,14 +172,11 @@ CCFLAGS += -fno-rtti -fno-builtin  -fomit-frame-pointer -fno-exceptions \
 	  -Wall -Wno-non-virtual-dtor -Wno-format   \
 	  $(CFLAGS_$(ARCH)) $(CFLAGS_$(CPU)) $(CFLAGS_$(PLATFORM)) 
 
-ifeq ("$(CC_VERSION)", "4")
 CCFLAGS += -Wno-conversion
-ifneq ("$(CC_SUBVERSION)", "0")
+CCFLAGS += -Wno-nonnull-compare
+CCFLAGS += -Wno-c++11-compat
 CCFLAGS += -fno-stack-protector
-endif
-else
-CCFLAGS += -Wconversion
-endif
+CCFLAGS += -std=gnu++03
 
 ifeq ("$(CONFIG_DEBUG_SYMBOLS)","y")
 CCFLAGS  += -g
+++ a/user/Mk/l4.base.mk
@@ -44,11 +44,9 @@ CFLAGS+=	-O2 -g -Wall -Wshadow \
 		$(CFLAGS_$(ARCH))
 LDFLAGS+=	$(LDFLAGS_$(ARCH))
 
-ifeq ("$(CC_VERSION)", "4")
-CFLAGS += -Wno-conversion
-else
-CFLAGS += -Wconversion
-endif
+CFLAGS   += -Wno-conversion
+CPPFLAGS += -Wno-c++11-compat
+CPPFLAGS += -std=gnu++03
 
 
 # Create early targets so that a make without args (implicit all) does
+++ a/user/configure.in
@@ -261,9 +261,7 @@ CXXFLAGS="-fno-exceptions $CXXFLAGS"
 
 CC_VERSION=`echo __GNUC__ | $CC -E  - | grep -v "\#"`
 CC_SUBVERSION=`echo __GNUC_MINOR__ | $CC -E  - | grep -v "\#"`
-if test "$CC_VERSION" = "4" -a "$CC_SUBVERSION" -ge "1"; then
 CFLAGS="-fno-stack-protector $CFLAGS"
-fi
 
 
 dnl Architecture dependent settings.