This is the same problem as bug 7188, but I thought I would report it so that people could see that it was also
happening on different operating systems. (Since I couldn't add a note to an already existing bug).

Cullin

make[2]: Entering directory `/usr/local/src/php-4.0.3pl1/ext/sockets'
make[3]: Entering directory `/usr/local/src/php-4.0.3pl1/ext/sockets'
/bin/sh /usr/local/src/php-4.0.3pl1/libtool --silent --mode=compile gcc  -I. -I/usr/local/src/php-4.0.3pl1/ext/sockets -I/usr/local/src/php-4.0.3pl1 -I/usr/local/src/php-4.0.3pl1/main -I/usr/local/apache-1.3.12/include -I/usr/local/src/php-4.0.3pl1/Zend -I/usr/local/src/php-4.0.3pl1 -I/usr/local/mysql-3.22.32/include/mysql -I/usr/local/src/php-4.0.3pl1/ext/xml/expat/xmltok -I/usr/local/src/php-4.0.3pl1/ext/xml/expat/xmlparse -I/usr/local/src/php-4.0.3pl1/TSRM  -DXML_BYTE_ORDER=12 -g -O2  -c sockets.c
sockets.c: In function `php_minit_sockets':
sockets.c:189: `MSG_WAITALL' undeclared (first use in this function)
sockets.c:189: (Each undeclared identifier is reported only once
sockets.c:189: for each function it appears in.)