Skip test requiring more (not found in nixpkgs).
--- gzip-1.5/tests/Makefile.in.orig	2013-02-23 15:15:08.017048868 +0000
+++ gzip-1.5/tests/Makefile.in	2013-02-23 15:15:32.756197039 +0000
@@ -1441,8 +1440,7 @@
   zfgrep	\
   zforce	\
   zgrep		\
   zless		\
-  zmore		\
   znew
 
 TESTS_ENVIRONMENT = \