trv: init at 0.1.3

This adds the trv ocaml build tool to the system

pkgs/development/tools/misc/trv/default.nix

@@ -0,0 +1,39 @@
+{stdenv, fetchFromGitHub, ocaml, findlib, camlp4, core, async, async_unix, re2,
+  async_extra, sexplib, async_shell, core_extended, async_find, cohttp, uri, tzdata}:
+
+let
+  ocaml_version = (builtins.parseDrvName ocaml.name).version;
+  version = "0.1.3";
+in
+
+assert stdenv.lib.versionOlder "4.02" ocaml_version;
+
+stdenv.mkDerivation {
+  name = "trv-${version}";
+
+  src = fetchFromGitHub {
+    owner = "afiniate";
+    repo = "trv";
+    rev = "${version}";
+    sha256 = "0fv0zh76djqhkzfzwv6k60rnky50pw9gn01lwhijrggrcxrrphz1";
+  };
+
+
+  buildInputs = [ ocaml findlib camlp4 ];
+  propagatedBuildInputs = [ core async async_unix
+                            async_extra sexplib async_shell core_extended
+                            async_find cohttp uri re2 ];
+
+  createFindlibDestdir = true;
+  dontStrip = true;
+
+  installFlags = "SEMVER=${version} PREFIX=$out";
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/afiniate/trv;
+    description = "Shim for vrt to enable bootstrapping";
+    license = licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+    platforms = ocaml.meta.platforms;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -4833,6 +4833,12 @@ let
 
   tinycc = callPackage ../development/compilers/tinycc { };
 
+  trv = callPackage ../development/tools/misc/trv {
+   inherit (ocamlPackages_4_02) findlib camlp4 core async async_unix 
+     async_extra sexplib async_shell core_extended async_find cohttp uri;
+    ocaml = ocaml_4_02;
+  };
+
   urweb = callPackage ../development/compilers/urweb { };
 
   vala = callPackage ../development/compilers/vala/default.nix { };