dev-libs/libevent-0.2.5 won't compile if there is no C++ compiler on the system (i.e. if gcc was emerged with USE="nocxx"). This can be fixed by adding epunt_cxx from the eutils eclass. I simply added the inherit statement and a simple src_unpack(): src_unpack() { unpack ${A} cd "${S}" elibtoolize epunt_cxx }
There's no libevent-0.2.5 anywhere in the tree.