Gentoo's Bugzilla –
Attachment 381356 Details for
Bug 487608net-p2p/rtorrent-0.8.9 with sys-devel/gcc-4.7.* - .../work/rtorrent-0.8.9/src/core/range_map.h:140:7: error: ‘erase’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]