mod_php wierdness with 'use oci8'

[abmhmd]

I emerged mod_php with no problems but then realized I don't have oracle support. Having looked at the mod_php ebuild I figured that I need to add oci8 to my use variables in order to get Oracle support. When I do that though I encounter funny errors:

configure: error: libpng not found!

If I remove png from my make.conf I get:

configure: error: libjpeg not found!

and so on and so forth. Anyone else encounter this error know what is going on? If I remove oci8 from my use var mod_php builds fine.