Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -38,7 +38,7 @@ endif
 CFLAGS_debug       = -O0 -g3
 CFLAGS_profile     = -O3 -pg -fno-inline -DNDEBUG
 CFLAGS_coverage    = -O0 --coverage
-CFLAGS_optimize    = -O3 -fomit-frame-pointer -DNDEBUG
+CFLAGS_optimize    = -fomit-frame-pointer -DNDEBUG
 LINKFLAGS_debug    =
 LINKFLAGS_profile  = -pg
 LINKFLAGS_coverage = --coverage
@@ -156,7 +156,7 @@ $(libfirm_dll): $(libfirm_OBJECTS)
 # Determine if we can use cparser-beta for quickcheck
 QUICKCHECK_DEFAULT := $(shell which cparser-beta 2> /dev/null || echo true) -fsyntax-only
 QUICKCHECK ?= $(QUICKCHECK_DEFAULT)
-QUICKCHECK_FLAGS ?= -m32 -Wno-compat-option -Wno-shadow -Wno-shadow-local -Wunreachable-code
+QUICKCHECK_FLAGS ?= -Wno-compat-option -Wno-shadow -Wno-shadow-local -Wunreachable-code
 
 $(builddir)/%.o: %.c $(IR_SPEC_GENERATED_INCLUDES)
 	@echo CC $@
@@ -196,8 +196,10 @@ REVISION ?= $(shell git --git-dir $(top_srcdir)/.git d
 # Update revision.h if necessary
 REVISIONH = $(gendir)/firm_revision.h
 libfirm_INCLUDEDIRS += $(gendir)
+# gmake 4.2.1 > 4.3 backward-incompatibility
+H = \#
 UNUSED2 := $(shell \
-	REV="\#define libfirm_VERSION_REVISION \"$(REVISION)\""; \
+	REV="$(H)define libfirm_VERSION_REVISION \"$(REVISION)\""; \
 	echo "$$REV" | cmp -s - "$(REVISIONH)" 2> /dev/null || echo "$$REV" > "$(REVISIONH)" \
 )