diff --git a/configure.ac b/configure.ac
index 14ede4061..941e4b973 100644
--- a/configure.ac
+++ b/configure.ac
@@ -258,6 +258,7 @@ AC_SUBST(FLTKCAIROOPTION)
 
 AC_SUBST(FLLIBNAME)
 AC_SUBST(GLDEMOS)
+AC_SUBST(GLWLDEMO)
 AC_SUBST(GLLIBNAME)
 AC_SUBST(IMGLIBNAME)
 AC_SUBST(CAIROLIBNAME)
diff --git a/makeinclude.in b/makeinclude.in
index e17315543..49db6e705 100644
--- a/makeinclude.in
+++ b/makeinclude.in
@@ -115,7 +115,8 @@ CAIRODIR	= @CAIRODIR@
 EXEEXT		= @EXEEXT@
 
 # Do we build the OpenGL demos?
-GLDEMOS		= @GLDEMOS@
+GLDEMOS    = @GLDEMOS@
+GLWLDEMO   = @GLWLDEMO@
 
 # Do we build the threads demo?
 THREADS		= @THREADS@