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Replace BISON_PROG_GNU_M4 with Autoconf's AC_PROG_GNU_M4.
authorJoel E. Denny <jdenny@ces.clemson.edu>
Sun, 5 Apr 2009 00:58:46 +0000 (20:58 -0400)
committerJoel E. Denny <jdenny@ces.clemson.edu>
Sun, 5 Apr 2009 00:58:46 +0000 (20:58 -0400)
If the first m4 in $PATH is wrong, it keeps looking.  Moreover, its
requirements for a correct m4 are stricter.
* m4/m4.m4: Make it a symbolic link to submodules/autoconf/m4/m4.m4.
* configure.ac: Update to use AC_PROG_GNU_M4.
Reported by Eric Blake.


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