Gentoo's Bugzilla –
Attachment 309271 Details for
Bug 412353app-crypt/qca-2.0.3 with gcc-4.7 - botantools/botan/botan/secmem.h:217:41: error: ‘set’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]