autoreconf doesn't honor ACLOCAL_PATH

[Leonard Lausen]

I have set ACLOCAL_PATH to /usr/share/aclocal which contains pkg.m4 that
is required for a package a would like to compile. However, simply
running autoreconf --install --force doesn't pick up pkg.m4. Only if
/usr/share/aclocal is specified via the -I flag pkg.m4 is picked up.

$ autoreconf --version
autoreconf (GNU Autoconf) 2.69
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>,
<http://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.

$ echo $ACLOCAL_PATH
/usr/share/ac

$ autoreconf --install --force
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `build-aux'.
libtoolize: copying file `build-aux/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
configure.ac:86: error: possibly undefined macro: AC_MSG_WARN
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /usr/local/GNU/autoconf-2.69/bin/autoconf failed with exit
status: 1


$ autoreconf --install --force -I /usr/share/aclocal
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `build-aux'.
libtoolize: copying file `build-aux/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'



aclocal was compiled from source by my system administrator:
➜  pyflame git:(master) ✗ aclocal --print-ac-dir
/usr/local/GNU/automake-1.15/share/aclocal