Minor modifications of some ocaml packages:

adds myself as a maintainer
adds assertions to have evaluation errors rather than build errors
moves opam out of ocamlPackages, as it does not provide a library

pkgs/development/ocaml-modules/biniou/default.nix

@@ -4,6 +4,9 @@ let
   version = "1.0.9";
   webpage = "http://mjambon.com/${pname}.html";
 in
+
+assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "3.11";
+
 stdenv.mkDerivation rec {
 
   name = "${pname}-${version}";
@@ -23,10 +26,11 @@ stdenv.mkDerivation rec {
     mkdir $out/bin
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A binary data format designed for speed, safety, ease of use and backward compatibility as protocols evolve";
     homepage = "${webpage}";
-    license = stdenv.lib.licenses.bsd3;
+    license = licenses.bsd3;
+    maintainers = [ maintainers.vbgl ];
     platforms = ocaml.meta.platforms;
   };
 }