In order to write bin/cue files GnomeBaker requires cdrdao. GnomeBaker will immediately fail if tried. Gnomebaker never officially states it requires it as a dependency either, which is rather odd.
Well cdrdao is optional i don't think is right to add cdrdao dependency to gnomebaker ebuild. I can add a info about this issue. Thanks for the report
I will add that info in the next upstream version.