Compiling 4.0.4 pl1 for iPlanet 4.1 on Solaris 2.7

I'm trying to compile PHP 4.0.4 pl1 on a Sun Solaris 2.7 platform to use with iPlanet Web Server 4.1. To configure, I run: configure --with-mysql=/usr/local/mysql --with-nsapi=/usr2/netscape/server/ --enable-track-vars --enable-libgcc I then run make, and immediately get the following output: Making all in Zend make[1]: Entering directory `/usr4/downloads/do/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 `/usr4/downloads/do/php-4.0.4pl1/Zend' make: *** [all-recursive] Error 1 Here's my environment: Sun Solaris 2.7 iPlanet Web Server 4.1 SP 5 gcc 2.95.2 automake 1.4 autoconf 2.13 bison 1.28 flex 2.5.4 m4 1.4 make 3.78.1 Can anyone give me any ideas as to what is wrong? This is a brand new system, with most of the software downloaded from sunfreeware.com and installed via pkgadd, so it's possible that there's a configuration problem with one of the packages, but I've no idea where to start looking. Thanks, Wally Hartshorn