Revert "Merge pull request #20090 from sternenseemann/master"

Reason: https://github.com/NixOS/nixpkgs/pull/20090#commitcomment-19686426

This reverts commit 9ffcb1b250, reversing
changes made to a6283c1126.

pkgs/development/ocaml-modules/x509/default.nix

@@ -1,30 +1,28 @@
-{stdenv, buildOcaml, fetchFromGitHub, ocaml, findlib, asn1-combinators, nocrypto, ounit, ocaml_oasis, ppx_sexp_conv}:
+{ stdenv, fetchzip, ocaml, findlib, asn1-combinators, nocrypto, ounit }:
 
-buildOcaml rec {
-  name = "x509";
-  version = "0.5.3";
+let version = "0.5.0"; in
 
-  src = fetchFromGitHub {
-    owner  = "mirleft";
-    repo   = "ocaml-x509";
-    rev    = "${version}";
-    sha256 = "07cc3z6h87460z3f4vz8nlczw5jkc4vjhix413z9x6nral876rn7";
+stdenv.mkDerivation {
+  name = "ocaml-x509-${version}";
+
+  src = fetchzip {
+    url = "https://github.com/mirleft/ocaml-x509/archive/${version}.tar.gz";
+    sha256 = "0i9618ph4i2yk5dvvhiqhm7wf3qmd6b795mxwff8jf856gb2gdyn";
   };
 
-  buildInputs = [ ocaml ocaml_oasis findlib ounit ppx_sexp_conv ];
+  buildInputs = [ ocaml findlib ounit ];
   propagatedBuildInputs = [ asn1-combinators nocrypto ];
 
   configureFlags = "--enable-tests";
-  configurePhase = "./configure --prefix $out $configureFlags";
-
   doCheck = true;
   checkTarget = "test";
   createFindlibDestdir = true;
 
-  meta = with stdenv.lib; {
+  meta = {
     homepage = https://github.com/mirleft/ocaml-x509;
     description = "X509 (RFC5280) handling in OCaml";
-    license = licenses.bsd2;
-    maintainers = with maintainers; [ vbgl ];
+    platforms = ocaml.meta.platforms or [];
+    license = stdenv.lib.licenses.bsd2;
+    maintainers = with stdenv.lib.maintainers; [ vbgl ];
   };
 }