diff --git a/sofort.sh b/sofort.sh
index eb3123c..72fdc19 100755
--- a/sofort.sh
+++ b/sofort.sh
@@ -105,7 +105,21 @@ done
 cp "$srcdir"/COPYING.SOFORT "$dstdir" || exit 2
 cp "$srcdir"/src/internal/argv/argv.h "$dstdir"/src/internal/argv || exit 2
 
-# seven: finalize
+# seven: remove dummy interfaces
+rm "$dstdir"/src/output/* || exit 2
+
+recipe="$dstdir"/project/common.mk
+files=$(find . -type f)
+
+grep -v 'src/output' "$recipe" > "$recipe".tmp || exit 2
+mv "$recipe".tmp "$recipe" || exit 2
+
+for f in $files; do
+	grep -v 'dummy' "$f" > "$f".tmp
+	mv "$f".tmp "$f" || exit 2
+done
+
+# eight: finalize
 uppername=`echo "$project" | tr '[:lower:]' '[:upper:]'`
 utilcsrc=src/$project.c