Adding libjpeg to a compiled php5

So, found out something interesting and weird about php5 today.

Apparently, if you compile php5 from source, and then later wish to compile with libjpeg support, you may not end up with libjpeg support for gd. There’s some sort of weird bug with php5′s config cache.

The solution is easy: rm config.cache before ./configure – recommend following that up with a make clean just because it’s usually a good idea to make clean before recompiling something.