Upgrading autotools on the machine used to make releases would probably help to fix issues on non-Linux systems such as AIX.
Here is a script to upgrade all configure.ac:
for d in $( find . -name configure.ac | sed 's@/[^/]*$@@' )
echo autoreconf/autoupdate for $d
( cd $d ; autoreconf -i && autoupdate ) || exit 1