A quick note to anyone building PHP with cURL or http extension support as well as one of the MySQL extensions (mysql, mysqli and pdo_mysql). The MySQL binaries found on mysql.com are built against yaSSL as opposed to the more common openssl against which libcurl (usede by cURL and HTTP extensions) is linked. The conflict between the two libraries causes curl initialization of the SSL layer to fail preventing startup of the PHP extensions.
To fix this problem you can either use older mysqlclient binaries (5.0.18 works) or compile MySQL yourself against openssl, either of these two will allow a working build of PHP with MySQL and curl support.
Building PHP with cURL and libmysqlclient5
After updating MySQL to 5.0.22 (needed for some projects) on our development box and recompiling PHP 4.2.2, I ended up with the following error at make install: PHP Fatal error: Unable to start curl module in Unknown on line 0It seems that this is indeed