as root on your x86 Slackware:

cd /scratchbox/tools/bin
ln -fs /scratchbox/tools/autotools/autoconf2.59/bin/autoconf autoconf2.50
cp /scratchbox/users/build/home/build/autoconf-wrapper .
rm autoconf
ln -fs autoconf-wrapper autoconf

ln -fs /scratchbox/tools/autotools/autoconf2.59/bin/autoheader autoheader2.50
rm autoheader
ln -fs autoconf-wrapper autoheader

ln -fs /scratchbox/tools/autotools/autoconf2.59/bin/autoreconf autoreconf2.50
rm autoreconf
ln -fs autoconf-wrapper autoreconf

# Debian uses automake-1.4 by default.