"Ambiguous declaration" build failure(s) — clang 3.9.1

PackageVersionSupposed error messageFull log Bug report
fim 0.5~rc2-5FbiStuffJpeg.cpp:181:36: error: use of overloaded operator '+' is ambiguous (with operand types 'fim::string' and 'const fim_char_t *' (aka 'const char *')) Log
herwig++ 2.6.0-1.1../../../include/Herwig++/MatrixElement/Matchbox/Utility/SpinorHelicity.h:95:12: error: use of overloaded operator '*=' is ambiguous (with operand types 'std::complex >' and 'Complex' (aka 'complex')) Log

2 errors