编译安装 apache +mysql +php 出现的问题

cgc837

安装大致上成功，在浏览器上可以打开PHP网页。
只是PHP文件上用到mysql_connect函数就出错。

1. Fatal error: Call to undefined function mysql_connect() in /var/www/index.php on line 2

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编译apache的命令：

1. ./configure --prefix=/opt/apache --enable-track-vars --enable-cgi --with-config-file-path=/opt/apache/conf --enable-so

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MYSQL是二进制安装，单独使用MYSQL没问题。
编译PHP的命令：

1. ./configure -prefix=/opt/php -with-mysql-dir=/opt/mysql -enable-bcmath -with-zlib -with-gd -with-jpeg-dir -enable-gd-native-ttf -with-ttf -with-freetype-dir -enable-memory-limit -enable-zend-multibyte -disable-ipv6 -disable-path-info-check -with-iconv -with-pear -disable-debug -with-mail -with-apxs2=/opt/apache/bin/apxs && make && make install
   

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请问这是怎么回事，要怎么做。