Solves the following compilation problem:
clang: error: argument unused during compilation: '-s' [-Werror,-Wunused-command-line-argument]
--- md5/Makefile.in.orig	2017-10-11 11:33:37.000000000 +0200
+++ md5/Makefile.in	2017-10-11 11:33:43.000000000 +0200
@@ -6,7 +6,7 @@
 all: md5.o
 
 md5.o: md5.c
-	${CC} $(DEFAULT_CFLAGS) $(CFLAGS) $(INCLUDES) -I.. -fPIC -o md5.o -c -s md5.c
+	${CC} $(DEFAULT_CFLAGS) $(CFLAGS) $(INCLUDES) -I.. -fPIC -o md5.o -c md5.c
 
 clean:
 	rm -f *.o *.so.1 *.a