diff --git a/x11-toolkits/Makefile b/x11-toolkits/Makefile
index f66f277e66c0..0062d132d16f 100644
--- a/x11-toolkits/Makefile
+++ b/x11-toolkits/Makefile
@@ -78,6 +78,7 @@
     SUBDIR += qt145
     SUBDIR += qt22
     SUBDIR += qt22-static
+    SUBDIR += qt23
     SUBDIR += rep-gtk
     SUBDIR += ruby-fltk
     SUBDIR += ruby-fox