opening w3af I see:
If you want to render HTML responses, you need to install at least one of rendering engines:
python-webkit, python-gtkmozembed, python-gtkhtml2
If you want, you can add an use with a depend.
The corresponding names for Gentoo are:
Could you confirm that theses packages solves your problem ?
Fixed in 1.1
dev-python/gtkmozembed-python is masked for removal. we can't depend on that :/
Closing this as CANTFIX