Problem installing PHP with Informix support

Group,

I'm attempting to install PHP with support for the Informix database on 
a Red Hat Linux Advanced Server 3 IA64 machine.  I'm trying to create 
an RPM file, so I've edited the php.spec file to include:

 --with-informix=/opt/informix

and I've put the path to the informix libraries in the environment 
variable LD_LIBRARY_PATH

and I'm running the command 'rpmbuild -ba /path/to/spec/file/php.spec'

This is the error I'm seeing.

//usr/bin/ld: cannot find -lphpifx
collect2: ld returned 1 exit status
usr/bin/ld: cannot find -lphpifx
collect2: ld returned 1 exit status
make: *** [sapi/cgi/php] Error 1
make: *** Waiting for unfinished jobs....
make: *** [sapi/cli/php] Error 1
error: Bad exit status from /var/tmp/rpm-tmp.74613 (%build)


RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.74613 (%build)

I'd appreciate any suggestions.  Google comes up empty on this one.

Thanks in advance

Brad Kittredge