--- Makefile.orig	2013-09-22 17:25:43.000000000 +0200
+++ Makefile	2013-09-22 17:30:15.000000000 +0200
@@ -77,5 +77,11 @@
 	@${REINPLACE_CMD} -e '/^install-data-am:/,/^[a-z]/ s|install-readmeDATA||' \
 		${WRKSRC}/Makefile.in
 .endif
+.if ${PORT_OPTIONS:MGPS}
+	@${REINPLACE_CMD} \
+		-e 's/champlain-0\.4/champlain-0.8/g' \
+		-e 's/champlain-gtk-0\.4/champlain-gtk-0.8/g' \
+		${WRKSRC}/configure
+.endif
 
 .include <bsd.port.mk>