(GZIP_ENV): Don't use --rsyncable if gzip doesn't

support it.  (The latest stable gzip doesn't.)

Makefile.maint

@@ -2,7 +2,7 @@
 # This Makefile fragment is shared between the coreutils,
 # CPPI, Bison, and Autoconf.
 
-## Copyright (C) 2001-2003 Free Software Foundation, Inc.
+## Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -24,7 +24,12 @@
 ME := Makefile.maint
 
 # Do not save the original name or timestamp in the .tar.gz file.
-GZIP_ENV = '--no-name --best --rsyncable'
+GZIP_ENV = \
+  "--no-name --best$$( \
+    case $$(gzip --help) in \
+    (*--rsyncable*) echo ' --rsyncable';; \
+    esac \
+  )"
 
 CVS = cvs