Seems that the ebuild is missing a dependency on openGL libraries Reproducible: Always Steps to Reproduce: 1. 2. 3.
Just found out it isn't a missing depend - The problem was resolved by running opengl-update and emerging again; so ebuild is just missing a check that some GL implementation was selected...
There is no compilation for Boa, its all python scripts, so I think you may have seen that error when emerging either wxGTK or wxPython. Re-open if necessary.