simplified the die-line when aclocal fails, the previous one confused

echo "buildconf: running libtoolize"

${LIBTOOLIZE:-libtoolize} --copy --automake --force || die "The command '${LIBTOOLIZE:-libtoolize}  --copy --automake --force' failed"

echo "buildconf: running aclocal"

${ACLOCAL:-aclocal} $ACLOCAL_FLAGS || die "The command '${ACLOCAL:-aclocal}${ACLOCAL_FLAGS:+" $ACLOCAL_FLAGS"}' failed"

${ACLOCAL:-aclocal} $ACLOCAL_FLAGS || die "The aclocal command line failed"

echo "buildconf: running aclocal hack to convert all mv to mv -f"

perl -i.bak -pe 's/\bmv +([^-\s])/mv -f $1/g' aclocal.m4

echo "buildconf: running autoheader"