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From: Richard Stallman <rms@gnu.org>
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Subject: Re: [rudy@gnu.org: Re: [Savannah-hackers] [teirllm@dms.auburn.edu:
 Re:	emacs/src/regex.c]]
Date: Sun, 28 Dec 2003 15:49:57 -0500
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    CLISP (http://clisp.cons.org) comes with regexp.[ch] of 1994.
    they are used only if the libc does not provide its own regexp.
    I wonder if Emacs could do the same, i.e., rely on the OS.

This won't work for Emacs.  It uses many nonstandard features
of this regex.[ch] version.