("libpthread" ,(origin
                               (method git-fetch)
                               (uri (git-reference
                                     (url "git://git.sv.gnu.org/hurd/libpthread")
                                     (commit "fa9eb2c255e1d46beadcd81edd459b9c3d7dcb8c")))
                               (sha256
                                (base32 
                                 "0v4hy6yimshbvhbhdbbjdir5fm3xr56zj3lnpf01d4nfa0c1h8k1"))))