diff --git a/libcc1/cc1plugin-config.h.in b/libcc1/cc1plugin-config.h.in
index ac06357bad4..ec972261c9f 100644
--- a/libcc1/cc1plugin-config.h.in
+++ b/libcc1/cc1plugin-config.h.in
@@ -10,6 +10,9 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if you have the <libgen.h> header file. */
+#undef HAVE_LIBGEN_H
+
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H