diff --git a/tools/build/depend-cleanup.sh b/tools/build/depend-cleanup.sh
index e7e7f30ab16..a7c27a4ba73 100755
--- a/tools/build/depend-cleanup.sh
+++ b/tools/build/depend-cleanup.sh
@@ -128,3 +128,6 @@ if [ -f "$OBJTOP"/secure/lib/libcrypto/aria.o ]; then
 	    "$OBJTOP"/obj-lib32/secure/lib/libcrypto \
 	    "$OBJTOP"/obj-lib32/secure/lib/libssl
 fi
+
+# 20230711  ee8b0c436d72    replace ffs/fls implementations with clang builtins
+clean_dep   lib/libc        ffs S