--- WindowMaker/Defaults/Makefile.in.orig	2015-10-06 04:12:10 UTC
+++ WindowMaker/Defaults/Makefile.in
@@ -542,7 +542,9 @@ WMWindowAttributes: $(srcdir)/WMWindowAt
 	chmod 644 WMWindowAttributes
 
 WindowMaker: $(srcdir)/WindowMaker.in
-	$(AM_V_GEN)sed -e "s:#pkgdatadir#:$(pkgdatadir):" $(srcdir)/WindowMaker.in \
+	$(AM_V_GEN)sed -e "s:#pkgdatadir#:$(pkgdatadir):" \
+		-e "s:#prefix#:$(prefix):" \
+		$(srcdir)/WindowMaker.in \
 		> WindowMaker ; \
 	chmod 644 WindowMaker