in the libsigc++-1.2.2 the mirror is defined as mirror:/sourcef... it should be mirror://sourcef...
fixed in cvs http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/dev-libs/libsigc%2B% 2B/libsigc%2B%2B-1.2.2.ebuild.diff?r1=text&tr1=1.3&r2=text&tr2=1.4&diff_format=h thx
*** Bug 13410 has been marked as a duplicate of this bug. ***