Greetings,
        I searched through the forum pages and the archive and didn't find a solution. Here's what I'm doing - Solaris 2.6, with iPlanet in /opt/iplanet and mySQL in /usr/local/bin/mysql.

configure  --with-nsapi=/opt/iplanet --with-mysql=/usr/local/mysql

Configure runs fine, and produces no errors.

Immediately after issue the make command I get 

Making all in Zend
make[1]: Entering directory `/usr/local/php-4.0.4pl1/Zend'
/bin/sh ../libtool --silent --mode=compile c++ -DHAVE_CONFIG_H -I. -I. -I../main   -D_POSIX_PTHREAD_SEMANTICS -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -DXML_BYTE_ORDER=21 -I../TSRM  -g -O2 -pthreads -c zend_language_scanner_cc.cc
In file included from zend_language_scanner_cc.cc:2571:
zend_operators.h: In function `int is_numeric_string(char *, int, long int *, double *)':
zend_operators.h:84: implicit declaration of function `int finite(...)'
make[1]: *** [zend_language_scanner_cc.lo] Error 1
make[1]: Leaving directory `/usr/local/php-4.0.4pl1/Zend'
make: *** [all-recursive] Error 1

Any solutions ?
Thanks.