INFORMIX PROBLEM

Hi I'm trying to compile php 4.1.2 from the source RPM in RedHat 7.3 but I wasn't succesfully. Please does anybody know what it means the following error: *** Warning: Linking the shared library libphp4.la against the non-libtool *** objects /opt/informix/lib/esql/checkapi.o is not portable! /bin/sh /usr/src/redhat/BUILD/php-4.1.2/build-cgi/libtool --silent --mode=link gcc -I. -I/usr/src/redhat/BUILD/php-4.1.2/ -I/usr/src/redhat/BUILD/php-4.1.2/build-cgi/main -I/usr/src/redhat/BUILD/php-4.1.2 -I/usr/src/redhat/BUILD/php-4.1.2/build-cgi/Zend -I/usr/include/libxml2 -I/usr/include/freetype2/freetype -I/usr/include/imap -I/opt/informix/incl/esql -I/usr/include/mysql -I/usr/local/include -I/usr/include/pspell -I/usr/include/ucd-snmp -I/usr/local/freetds/include/include -I/usr/src/redhat/BUILD/php-4.1.2/main -I/usr/src/redhat/BUILD/php-4.1.2/Zend -I/usr/src/redhat/BUILD/php-4.1.2/TSRM -I/usr/src/redhat/BUILD/php-4.1.2/build-cgi/TSRM -O2 -march=i386

-mcpu=i686 -fPIC  -L/usr/kerberos/lib -o php -export-dynamic    stub.lo libphp4.la

/usr/bin/ld: cannot find -lifsql collect2: ld returned 1 exit status make[1]: *** [php] Error 1 make[1]: Saliendo directorio `/usr/src/redhat/BUILD/php-4.1.2/build-cgi' make: *** [all-recursive] Error 1 error: Bad exit status from /var/tmp/rpm-tmp.72521 (%build) RPM build errors: Bad exit status from /var/tmp/rpm-tmp.72521 (%build) Thanks in Advance. Luigi.