ocamlPackages.camlp4 : add version for ocaml_4_03

pkgs/development/tools/ocaml/camlp4/4_03.nix

@@ -0,0 +1,45 @@
+{stdenv, fetchzip, which, ocaml, ocamlbuild}:
+let
+  ocaml_version = (stdenv.lib.getVersion ocaml);
+  version = "4.03+1";
+
+in
+
+assert stdenv.lib.versionAtLeast ocaml_version "4.02";
+
+stdenv.mkDerivation {
+  name = "camlp4-${version}";
+  src = fetchzip {
+    url = "https://github.com/ocaml/camlp4/archive/${version}.tar.gz";
+    sha256 = "1f2ndch6f1m4fgnxsjb94qbpwjnjgdlya6pard44y6n0dqxi1wsq";
+  };
+
+  buildInputs = [ which ocaml ocamlbuild ];
+
+  dontAddPrefix = true;
+
+  preConfigure = ''
+    configureFlagsArray=(
+      --bindir=$out/bin
+      --libdir=$out/lib/ocaml/${ocaml_version}/site-lib
+      --pkgdir=$out/lib/ocaml/${ocaml_version}/site-lib
+    )
+  '';
+
+  postConfigure = ''
+    substituteInPlace camlp4/META.in \
+    --replace +camlp4 $out/lib/ocaml/${ocaml_version}/site-lib/camlp4
+  '';
+
+
+  makeFlags = "all";
+
+  installTargets = "install install-META";
+
+  meta = with stdenv.lib; {
+    description = "A software system for writing extensible parsers for programming languages";
+    homepage = https://github.com/ocaml/camlp4;
+    platforms = ocaml.meta.platforms or [];
+  };
+}
+