--- Libc/Libc-391.1.21/ppc64/string/Makefile.inc
+++ Libc/Libc-594.9.1/ppc64/string/Makefile.inc
@@ -5,6 +5,10 @@
 MDSRCS +=	\
      bcopy.s	\
      bzero.s	\
+     ffs.s	\
+     ffsl.s	\
+     fls.s	\
+     flsl.s	\
      memset.s   \
      memcmp.s	\
      strcat.s	\