$NetBSD: patch-format_docbook_epub,v 1.1 2015/12/11 23:31:09 joerg Exp $

--- format/docbook/epub.orig	2015-12-11 20:30:43.000000000 +0000
+++ format/docbook/epub
@@ -1,4 +1,4 @@
-if [ -z "`type -t $ZIP_PATH`" ]
+if ! type "$ZIP_PATH" > /dev/null 2>&1
 then
   echo >&2 "Missing zip utility at $ZIP_PATH, conversion to epub not possible."
   echo >&2 "Exiting !"