doesnt compile with syndic.1.4

[avsm]

#=== ERROR while installing river.0.1.2 =======================================#
# opam-version 1.2.2
# os           darwin
# command      make
# path         /Users/avsm/.opam/system/build/river.0.1.2
# compiler     system (4.02.2)
# exit-code    2
# env-file     /Users/avsm/.opam/system/build/river.0.1.2/river-62514-550cb1.env
# stdout-file  /Users/avsm/.opam/system/build/river.0.1.2/river-62514-550cb1.out
# stderr-file  /Users/avsm/.opam/system/build/river.0.1.2/river-62514-550cb1.err
### stdout ###
# [...]
# /Users/avsm/.opam/system/bin/ocamlfind ocamlc -c -g -annot -bin-annot -package cohttp.lwt -package lwt -package netstring -package syndic -I lib -o lib/ri_posts.cmo lib/ri_posts.ml
# + /Users/avsm/.opam/system/bin/ocamlfind ocamlc -c -g -annot -bin-annot -package cohttp.lwt -package lwt -package netstring -package syndic -I lib -o lib/ri_posts.cmo lib/ri_posts.ml
# File "lib/ri_posts.ml", line 240, characters 55-56:
# Error: The function applied to this argument has type
#          ?type_media:string ->
#          ?hreflang:string ->
#          ?title:string ->
#          ?length:int -> ?rel:Syndic.Atom.rel -> Syndic_atom.link
# This argument cannot be applied without label
# Command exited with code 2.
### stderr ###
# E: Failure("Command ''/usr/local/bin/ocamlbuild' lib/river.cma lib/river.cmxa lib/river.a lib/river.cmxs -tag debug' terminated with error code 10")
# make: *** [build] Error 1