It is hard to figure out,but I inspect the source code,told me:
http://ftp.openbsd.org/pub/OpenBSD/4.9/sys.tar.gz:/usr.bin/m4/PSD.doc/m4.ms:
Line35: m4.ms 6.3 (Berkeley) 6/5/93
On Wed, Oct 19, 2011 at 05:12, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Young <yayooo@gmail.com> writes:
>> I've update my m4 to version 1.4.13
>> from:
>> http://ftp.openbsd.org/pub/OpenBSD/4.9/packages/amd64/m4-1.4.13.tgz
>> the problem solved perfectly!
>
> Just for the archives' sake, can you confirm which m4 version you had
> before?
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0regards, tom lane
>