1 files changed, 5 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index a83b21b26..01060dedf 100644
--- a/Makefile
+++ b/Makefile
@@ -123,7 +123,7 @@ LDFLAGS += -rdynamic
 LDLIBS += -lrt
 endif
 
-YOSYS_VER := 0.9+3667
+YOSYS_VER := 0.9+3686
 GIT_REV := $(shell cd $(YOSYS_SRC) && git rev-parse --short HEAD 2> /dev/null || echo UNKNOWN)
 OBJS = kernel/version_$(GIT_REV).o
 
@@ -661,6 +661,10 @@ ifeq ($(LINK_ABC),1)
 OBJS += $(PROGRAM_PREFIX)yosys-libabc.a
 endif
 
+# prevent the CXXFLAGS set by this Makefile from reaching abc/Makefile,
+# especially the -MD flag which will break the build when CXX is clang
+unexport CXXFLAGS
+
 top-all: $(TARGETS) $(EXTRA_TARGETS)
 	@echo ""
 	@echo "  Build successful."