diff --git a/src/config.h.in b/src/config.h.in
index 79cb37c..1b84955 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -9,6 +9,9 @@
 /* Define unless no X support found */
 #undef HAVE_X11
 
+/* Define unless no Wayland support found */
+#undef HAVE_WAYLAND
+
 /* Define when terminfo support found */
 #undef TERMINFO
 
@@ -505,6 +508,9 @@
 /* Define if we have flock() */
 #undef HAVE_FLOCK
 
+/* Define if we have shm_open() */
+#undef HAVE_SHM_OPEN
+
 /* Define to inline symbol or empty */
 #undef inline