Check for a GNU version of m4, since autoconf won't run nicely without one.

echo "buildconf: libtool version $lt_version (ok)"

#--------------------------------------------------------------------------

# m4 check

#

m4=`${M4:-m4} --version 2>/dev/null|head -1`;

m4_version=`echo $m4 | sed -e 's/^.* \([0-9]\)/\1/' -e 's/[a-z]* *$//'`

if { echo $m4 | grep "GNU" >/dev/null 2>&1; } then

  echo "buildconf: GNU m4 version $m4_version (ok)"

else

  echo "buildconf: m4 version $m4 found. You need a GNU m4 installed!"

  exit 1

fi

# ------------------------------------------------------------

# run the correct scripts now