How To Build mod_fastcgi For Apache2 On OpenSUSE 12.2

mod_fastcgi is needed for Apache prior to 2.4 to work with PHP-FPM. There is an apache2-mod_fastcgi package for OpenSUSE, but unfortunately it is buggy: it does not allow you to use the FastCgiExternalServer directive inside a vhost, although the official mod_fastcgi documentation says that this is allowed. This guide explains how to build a new mod_fastcgi from the sources for Apache2 on an OpenSUSE 12.2 system to fix this problem.