None of the pwlib-ebuilds compile on gcc 3, with a lot of errors, saying "../../ptclib/asner.cxx:2713: choosing `P_PCharArray_PTemplate_Base_Type PCharArray_PTemplate::operator[](unsigned int) const' over `operator[]' ../../ptclib/asner.cxx:2713: because worst conversion for the former is better than worst conversion for the latter " The URL points to a fix.
pwlib 1.3.1 fixes this. Masked for now, but working.