From: Joel E. Denny <jdenny@clemson.edu>
Date: Wed, 16 Dec 2009 00:11:42 +0000 (-0500)
Subject: Import M4 detection fix from Autoconf.
X-Git-Tag: v2.4.1a~16
X-Git-Url: https://git.saurik.com/bison.git/commitdiff_plain/dfff6628178e75cc2d23ad574f14bc540249258c?ds=inline;hp=dfff6628178e75cc2d23ad574f14bc540249258c

Import M4 detection fix from Autoconf.

Reported by Eric Blake.
* m4/m4.m4: Copy serial 10.
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