Problems using buildconf on OpenSolaris

Hi.

    I've tried to compile php 5.3.4 adding Informix PDO  on an OpenSolaris 
2009-6 system (prior to do so on productive server Solaris 9 Sparc). I installed 
gcc by OpenSolaris package, and m4 1.4 and  autoconf 2.13 from GNU sources 
(OpenSolaris has autoconf 2.5x and I wasn't able to install m4 package from 
OpenSolaris).

    Next I ran buildconf, and it sent the following:

./buildconf --force produce que
Forcing buildconf
buildconf: checking installation...
buildconf: autoconf version 2.13 (ok)
make: fatal error in reader: build/build2.mk, line 31: Badly formed macro 
assignment
Current working directory  /export/home/spool/php-5.3.4
*** Error code 1
The following command caused the error:
make -s -f build/build2.mk
make: Fatal error: Command failed for target 'all'

    Did someone deal with this kind of problem on OpenSolaris or another unix 
O.S.?

    Thanks in advance

                                Omar Muñoz