sexplib 7.0.4 is now available from its new master home at the OCamlCore Forge. Project URL: http://forge.ocamlcore.org/projects/sexplib Tarball: http://forge.ocamlcore.org/frs/download.php/699/sexplib-7.0.4.tar.gz
7.0.4 (and its successor, 7.0.5) were added to Rawhide some time ago.