--- Rules.mak
+++ Rules.mak
@@ -249,6 +249,9 @@
 list-archive-members = $(if $(1),$(shell $(AR) t $(1)))
 variablify = $(strip $(subst /,_,$(subst :,_,$(subst ;,_,$(subst |,_,$(subst >,_,$(subst <,_,$(1))))))))
 
+MD5SUM = md5sum
+md5sum = $(shell echo -n '$1' | $(MD5SUM) | tr -d -c "0-9a-f")
+
 GEN_LIBS:=
 ifneq ($(LIBGCC_DIR),$(UCLIBCXX_RUNTIME_LIBDIR))
 GEN_LIBS += -L$(LIBGCC_DIR)
--- src/abi/libgcc_eh/Makefile.in
+++ src/abi/libgcc_eh/Makefile.in
@@ -3,7 +3,7 @@
 OBJS = $(call list-archive-members,$(LIBGCC_EH))
 libgcc_eh-$(IMPORT_LIBGCC_EH) := $(OBJS)
 
-LIBGCC_EH_VAR := $(call variablify,$(LIBGCC_EH))
+LIBGCC_EH_VAR := $(if $(LIBGCC_EH),$(call md5sum,$(LIBGCC_EH)))
 LIBGCC_EH_DEP := $(LIBGCC_EH_OUT).$(LIBGCC_EH_VAR).dep
 
 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
--- src/abi/libsupc/Makefile.in
+++ src/abi/libsupc/Makefile.in
@@ -4,7 +4,7 @@
 OBJS-OMIT = $(filter new_op%.o del_op%.o pure.o new_handler.o eh_alloc.o eh_globals.o,$(OBJS))
 libsupc-$(IMPORT_LIBSUP) := $(filter-out $(OBJS-OMIT),$(OBJS))
 
-LIBSUP_VAR := $(call variablify,$(LIBSUP))
+LIBSUP_VAR := $(if $(LIBSUP),$(call md5sum,$(LIBSUP)))
 LIBSUP_DEP :=$(LIBSUPC_OUT).$(LIBSUP_VAR).dep
 
 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)