Seems like newer version of paragui don't contain pgevent.h (name is not exactly right but I forgot the correct one and don't consider it important enough) anymore. It got it to compile by changing --disable-paraguitest to --disable-paragui (as it is optional). Reproducible: Always Steps to Reproduce: 1. emerge paragui-1.1.7 2. emerge asc 3. watch it fail :-)
Well, I've found an easy (and obvious) solution. Change >=media-libs/paragui-1.0.1 into =media-libs/paragui-1.0.4 which is the latest 1.0.x version available through portage.
Actually, I like the first solution better. I've added it to the ebuild. Thanks for the bug report.