diff --git a/repos/libports/lib/import/import-gmp.mk b/repos/libports/lib/import/import-gmp.mk
index aabc59d7e..0ca6f3769 100644
--- a/repos/libports/lib/import/import-gmp.mk
+++ b/repos/libports/lib/import/import-gmp.mk
@@ -9,6 +9,10 @@ ifeq ($(filter-out $(SPECS),arm),)
 	INC_DIR += $(GMP_PORT_DIR)/include/spec/arm
 endif
 
+ifeq ($(filter-out $(SPECS),arm_64),)
+	REP_INC_DIR += include/spec/64bit/gmp
+	INC_DIR += $(GMP_PORT_DIR)/include/spec/arm_64
+endif
 ifeq ($(filter-out $(SPECS),x86_32),)
 	REP_INC_DIR += include/spec/32bit/gmp
 	INC_DIR += $(GMP_PORT_DIR)/include/spec/x86_32
diff --git a/repos/libports/lib/mk/gmp.inc b/repos/libports/lib/mk/gmp.inc
index e0d8ceb1a..f8c15e4b4 100644
--- a/repos/libports/lib/mk/gmp.inc
+++ b/repos/libports/lib/mk/gmp.inc
@@ -4,7 +4,7 @@ include $(REP_DIR)/lib/import/import-gmp.mk
 
 LIBS += libc
 
-CC_OPT += -DHAVE_CONFIG_H -D__GMP_WITHIN_GMP
+CC_OPT += -DHAVE_CONFIG_H -D__GMP_WITHIN_GMP -DCOUNT_LEADING_ZEROS_NEED_CLZ_TAB
 
 INC_DIR += $(REP_DIR)/include/gcc
 INC_DIR += $(GMP_DIR)
diff --git a/repos/libports/lib/mk/spec/arm_64/gmp-mpn.mk b/repos/libports/lib/mk/spec/arm_64/gmp-mpn.mk
new file mode 100644
index 000000000..3797c6366
--- /dev/null
+++ b/repos/libports/lib/mk/spec/arm_64/gmp-mpn.mk
@@ -0,0 +1,60 @@
+
+GMP_MPN_DIR = $(GMP_DIR)/mpn
+
+# this file uses the 'sdiv_qrnnd' symbol which is not defined
+FILTER_OUT += udiv_w_sdiv.c
+
+# add ARM-specific assembly files and filter out the generic C files if needed
+
+SRC_ASM += copyd.asm copyi.asm
+
+FILTER_OUT += popham.c
+FILTER_OUT += logops_n.c sec_div.c sec_pi1_div.c copyi.c copyd.c
+
+SRC_C += $(notdir $(wildcard $(REP_DIR)/src/lib/gmp/mpn/spec/64bit/*.c))
+SRC_C += $(filter-out $(FILTER_OUT),$(notdir $(wildcard $(GMP_MPN_DIR)/generic/*.c)))
+
+include $(REP_DIR)/lib/mk/gmp.inc
+
+PWD := $(shell pwd)
+
+SRC_O += $(SRC_ASM:.asm=.o) hamdist.o popcount.o
+
+#
+# Create execution environment for the m4-ccas tool, which is used by the gmp
+# library to assemble asm files to object files. Make sure to execute this rule
+# only from the actual build pass (not when called from 'dep_lib.mk'). This
+# way, the 'm4env' gets created within the local build directory of the
+# library, not the global build directory.
+#
+ifeq ($(called_from_lib_mk),yes)
+all: m4env
+endif
+
+m4env:
+	$(VERBOSE)mkdir -p $@/mpn/arm_64
+	$(VERBOSE)ln -s $(REP_DIR)/src/lib/gmp/spec/arm_64/config.m4 m4env
+	$(VERBOSE)ln -s $(GMP_MPN_DIR)/asm-defs.m4 m4env/mpn
+
+#
+# Create object files out of asm files
+#
+ifneq ($(VERBOSE),)
+M4_OUTPUT_FILTER = > /dev/null
+endif
+
+hamdist.o popcount.o: popham.c
+	$(MSG_COMP)$@
+	$(VERBOSE)$(CC) $(CC_DEF) $(CC_C_OPT) -DOPERATION_${@:.o=} $(INCLUDES) -c $< -o $@
+
+%.o: %.asm
+	$(MSG_ASSEM)$@
+	$(VERBOSE)cd m4env/mpn; \
+		$(GMP_MPN_DIR)/m4-ccas --m4=m4 $(CC) $(CC_MARCH) -std=gnu99 -fPIC -DPIC $(CC_OPT_$*) $(INCLUDES) -c $< -o $(PWD)/$@ \
+			$(M4_OUTPUT_FILTER)
+
+vpath %.c   $(REP_DIR)/src/lib/gmp/mpn/spec/64bit
+vpath %.c   $(GMP_MPN_DIR)/generic
+vpath %.asm $(GMP_MPN_DIR)/arm64
+
+CC_CXX_WARN_STRICT =
diff --git a/repos/libports/ports/gmp.hash b/repos/libports/ports/gmp.hash
index 9141bda55..724b0e618 100644
--- a/repos/libports/ports/gmp.hash
+++ b/repos/libports/ports/gmp.hash
@@ -1 +1 @@
-07b77c4f05fe9aefdbd217f5b42382100f270b62
+855680cf4411a440d5353ea01c55ee6289c67b26
diff --git a/repos/libports/ports/gmp.port b/repos/libports/ports/gmp.port
index 8d9f6104c..8115d6c91 100644
--- a/repos/libports/ports/gmp.port
+++ b/repos/libports/ports/gmp.port
@@ -11,7 +11,8 @@ DIR(gmp) := src/lib/gmp
 DIRS := include
 DIR_CONTENT(include) := ${DIR(gmp)}/gmp-impl.h
 
-DIRS += $(addprefix include/spec/, x86_32 x86_64 arm)
+DIRS += $(addprefix include/spec/, x86_32 x86_64 arm arm_64)
 DIR_CONTENT(include/spec/x86_32) := ${DIR(gmp)}/mpn/x86/pentium/gmp-mparam.h
 DIR_CONTENT(include/spec/x86_64) := ${DIR(gmp)}/mpn/x86_64/gmp-mparam.h
 DIR_CONTENT(include/spec/arm)    := ${DIR(gmp)}/mpn/arm/gmp-mparam.h
+DIR_CONTENT(include/spec/arm_64) := ${DIR(gmp)}/mpn/arm64/gmp-mparam.h
diff --git a/repos/libports/src/lib/gmp/spec/arm_64/config.m4 b/repos/libports/src/lib/gmp/spec/arm_64/config.m4
new file mode 100644
index 000000000..9913ffbc3
--- /dev/null
+++ b/repos/libports/src/lib/gmp/spec/arm_64/config.m4
@@ -0,0 +1,35 @@
+dnl config.m4.  Generated automatically by configure.
+changequote(<,>)
+ifdef(<__CONFIG_M4_INCLUDED__>,,<
+define(<CONFIG_TOP_SRCDIR>,<`../.'>)
+define(<WANT_ASSERT>,0)
+define(<WANT_PROFILING>,<`no'>)
+define(<M4WRAP_SPURIOUS>,<no>)
+define(<TEXT>, <.text>)
+define(<DATA>, <.data>)
+define(<LABEL_SUFFIX>, <:>)
+define(<GLOBL>, <.globl>)
+define(<GLOBL_ATTR>, <>)
+define(<GSYM_PREFIX>, <>)
+define(<RODATA>, <	.section	.rodata>)
+define(<TYPE>, <.type	$1,@$2>)
+define(<SIZE>, <.size	$1,$2>)
+define(<LSYM_PREFIX>, <.L>)
+define(<W32>, <.long>)
+define(<ALIGN_LOGARITHMIC>,<yes>)
+define(<SQR_TOOM2_THRESHOLD>,<28>)
+define(<BMOD_1_TO_MOD_1_THRESHOLD>,<30>)
+define(<SIZEOF_UNSIGNED>,<4>)
+define(<GMP_LIMB_BITS>,64)
+define(<GMP_NAIL_BITS>,0)
+define(<GMP_NUMB_BITS>,eval(GMP_LIMB_BITS-GMP_NAIL_BITS))
+>)
+changequote(`,')
+ifdef(`__CONFIG_M4_INCLUDED__',,`
+include(CONFIG_TOP_SRCDIR`/mpn/asm-defs.m4')
+define_not_for_expansion(`HAVE_HOST_CPU_aarch64')
+define_not_for_expansion(`HAVE_ABI_64')
+define_not_for_expansion(`HAVE_LIMB_LITTLE_ENDIAN')
+define_not_for_expansion(`HAVE_DOUBLE_IEEE_LITTLE_ENDIAN')
+')
+define(`__CONFIG_M4_INCLUDED__')