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.