name of m4 executable

[Marco Franzen]

Autoconf version 2.13

When I configured autoconf, it looked for GNU m4 under serveral names,
including gm4:
        checking for gm4... /usr/gnu/bin/gm4
After building and installing autoconf, this information was lost, and the
installed version did not find this very (g)m4. I would have expected the
installed autoconf to either use the (g(nu))m4 it found during its
configuration or to repeat the same search.

I configured and installed m4 1.4  with 
        --prefix=/usr/gnu --program-prefix=g
and autoconf with
        --prefix=/usr/gnu
(only).

When autoconf was used subsequently
(by a gcc snapshot configured with
        --prefix=/home/marcof/gnu
), it complained
        Autoconf requires GNU m4 1.1 or later
until I created a symlink from "~/bin/m4" -> "/usr/gnu/bin/gm4".

Both "~/bin" and "/usr/gnu/bin" are in my $PATH.

Cheers,

Marco
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