clang support is missing

[polluks]

I was able to compile, but the linker stops working
ld: unknown option: --cref

flexcat/src/Makefile

Line 505 in 38ad07c

@$(CC) $(LDFLAGS) -o $@.debug $(addprefix $(OBJDIR)/,$(OBJS)) $(LDLIBS) -Wl,--cref,-M,-Map=$@.map

another unknown option
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip: unrecognized option: --preserve-dates