diff --git a/make-includes/local_configuration.make.in b/make-includes/local_configuration.make.in
index 35d4d22..723470f 100755
--- a/make-includes/local_configuration.make.in
+++ b/make-includes/local_configuration.make.in
@@ -67,6 +67,7 @@
 EPSTOPDF=@EPSTOPDF@
 INKSCAPE=@INKSCAPE@
 GS=@GS@
+XCF2PNG=@XCF2PNG@
 
 # Plotting tools.
 PLOTICUS=@PLOTICUS@