Westley Martínez <aniko...@gmail.com> added the comment:

I've already got a patch ready for #11678.

As for checking the compress command, perhaps we can accomplish it by comparing 
version information of the program:


$ compress --version
compress 1.4
Copyright (C) 2007 Free Software Foundation, Inc.
Copyright (C) 1993 Jean-loup Gailly.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.

Written by Jean-loup Gailly.


The last line may be the key. It says Jean-loup Gailly; he invented the gzip 
compression method, but not the LZW method used by the original compress 
program.

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