[arch-general] How to specify configure options with makepkg

I'm trying to install psychosynth from AUR. Ogre is one of the deps, but the comments on the psychosynth page say to compile Ogre with devIL, not freeimage, which is the default image loader. Configure says that I can set an option, --disable-freeimage, but where do I set this option when using makepkg to build Ogre? I have installed devil, so it's ready to be used by the configure script, which includes instructions for both freeimage, and devIL. Thanks for any help with this. Nigel.