--- a/src/pl.h
+++ b/src/pl.h
@@ -8,7 +8,7 @@
 #include <stdlib.h>
 #include "plg.h"
 
-#define PREFABS_DIR ""  	 /* INSTALLERS can set this to a valid pathname, so that users don't need to set PLOTICUS_PREFABS env var */
+#define PREFABS_DIR "@out@/share/ploticus/prefabs"  	 /* INSTALLERS can set this to a valid pathname, so that users don't need to set PLOTICUS_PREFABS env var */
 
 #define PLVERSION "2.42-May2013" /* see also the Copyright page, and page headers and footers */