What's wrong with configure on the Solaris 2.7/2.8 install

Php can't make. Looks like a bad configure. Calling for unix.h which doesn't exist on Solaris 2.8. Making all in Zend make[1]: Entering directory `/data/3/php/php-4.2.1/Zend' make[1]: Nothing to be done for `all'. make[1]: Leaving directory `/data/3/php/php-4.2.1/Zend' Making all in main make[1]: Entering directory `/data/3/php/php-4.2.1/main' make[2]: Entering directory `/data/3/php/php-4.2.1/main' /bin/sh /data/3/php/php-4.2.1/libtool --silent --mode=compile gcc -I. -I/data/3/php/php-4.2.1/main -I/data/3/php/php-4.2.1/main -I/data/3/php/php-4.2.1 -I/usr/local/apache/include -I/data/3/php/php-4.2.1/Zend -I/data/3/php/php-4.2.1/ext/mysql/libmysql -I/3rd_party/oracle/product/9.0.1/rdbms/public -I/3rd_party/oracle/product/9.0.1/rdbms/demo -I/data/3/php/php-4.2.1/ext/xml/expat -D_POSIX_PTHREAD_SEMANTICS -DSOLARIS2=280 -DUSE_EXPAT -I/data/3/php/php-4.2.1/TSRM -g -O2 -prefer-pic -c main.c In file included from php.h:34, from main.c:26: /data/3/php/php-4.2.1/Zend/zend.h:55: unix.h: No such file or directory In file included from main.c:26: php.h:71: unix.h: No such file or directory make[2]: *** [main.lo] Error 1 make[2]: Leaving directory `/data/3/php/php-4.2.1/main' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/data/3/php/php-4.2.1/main' make: *** [all-recursive] Error 1 Mike