Gentoo's Bugzilla –
Attachment 451488 Details for
Bug 598126sci-visualization/xds-viewer-0.6 : /.../CbfReader.cpp:318:24: error: no match for ‘operator==’ (operand types are ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ and ‘int’)