diff --git a/config.h.cmake b/config.h.cmake
index 7e8cb6a8..c76b9286 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -23,6 +23,9 @@
 /* Define to 1 if you have the <util.h> header file. */
 #cmakedefine HAVE_UTIL_H 1
 
+/* Define to 1 if you have the <libutil.h> header file. */
+#cmakedefine HAVE_LIBUTIL_H 1
+
 /* Define to 1 if you have the <termios.h> header file. */
 #cmakedefine HAVE_TERMIOS_H 1