Solaris 2.5.1 ignoring -D_POSIX_PTHREAD_SEMANTICS

I'm attempting to compile this morning's snapshot on an older Solaris box and I'm getting this: Making all in . make[1]: Entering directory `/export/home/products/php/src/php4/php4-200003141245' gcc -DHAVE_CONFIG_H -I. -I/export/home/products/php/src/php4/php4-2000031412 45/. -I. -I./Zend -I/export/home /products/php/src/php4/php4-200003141245 -I/products/apache/src/apache_1.3.1 2/src/include -I/products/apache /src/apache_1.3.12/src/os/unix -I/products/gd/sol/include -I/export/home/pro ducts/php/src/php4/php4-20000314 1245/ext/mysql/libmysql -I/disk1/oracle7/rdbms/demo -I/disk1/oracle7/network /public -I/export/home/products/ php/src/php4/php4-200003141245/ext/xml/expat/xmltok -I/export/home/products/ php/src/php4/php4-200003141245/e xt/xml/expat/xmlparse -DXML_BYTE_ORDER=21 -D_POSIX_PTHREAD_SEMANTICS -D_REE NTRANT -g -Wall -c main.c && to uch main.lo main.c: In function `php_message_handler_for_zend': main.c:602: too few arguments to function `asctime_r' make[1]: *** [main.lo] Error 1 make[1]: Leaving directory `/export/home/products/php/src/php4/php4-200003141245' make: *** [all-recursive] Error 1 It looks like -D_POSIX_PTHREAD_SEMANTICS is being ignored, and therefore gcc wants the non-POSIX version of asctime_r. Can anyone comment on this? Leon