diff --git a/gnu/lib/Makefile b/gnu/lib/Makefile
index 5753da8b40a7..6112624560de 100644
--- a/gnu/lib/Makefile
+++ b/gnu/lib/Makefile
@@ -9,8 +9,8 @@ SUBDIR.${MK_SSP}+=	libssp
 SUBDIR.${MK_TESTS}+=	tests
 SUBDIR.${MK_GDB}+=	libreadline
 
-.if ${MK_GNU_DIFF} != "no" || ${MK_GNU_GREP} != "no" || \
-    ${MK_GNU_GREP_COMPAT} != "no" || ${MK_GDB} != "no"
+.if ${MK_GNU_GREP} != "no" || ${MK_GNU_GREP_COMPAT} != "no" || \
+    ${MK_GDB} != "no"
 SUBDIR+=		libregex
 .endif