diff -urNad dutch.orig/dutch-2.10/debian/rules dutch/dutch-2.10/debian/rules
--- dutch.orig/dutch-2.10/debian/rules	2015-02-07 12:38:46.229769531 +0000
+++ dutch/dutch-2.10/debian/rules	2015-02-07 12:46:24.518334494 +0000
@@ -14,7 +14,7 @@
 	mkdir -p myspell
 	mkdir -p wdutch
 	chmod +x convert
-	./convert
+	GZIP=-9n ./convert
 	touch build-stamp
 
 clean: