From cdb97ba52397fc059f47758d4dc8311fe044f44f Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Sat, 20 Feb 2021 13:09:34 +0100
Subject: [PATCH] ocamlPackages.ocamlmod: disable tests if ounit is not
 available

When we redid ounit and ounit2, the minimumOCamlVersion was also pushed
to OCaml 4.04. ocamlmod builds on earlier versions as well, but doesn't
evaluate if we pull in ounit.

Therefore we conditionally disable tests for OCaml < 4.04 which means
for example oasis is available for those versions again as well.
---
 pkgs/development/tools/ocaml/ocamlmod/default.nix | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/tools/ocaml/ocamlmod/default.nix b/pkgs/development/tools/ocaml/ocamlmod/default.nix
index 77d390295512..cf24a132210b 100644
--- a/pkgs/development/tools/ocaml/ocamlmod/default.nix
+++ b/pkgs/development/tools/ocaml/ocamlmod/default.nix
@@ -1,5 +1,10 @@
 { lib, stdenv, fetchurl, ocaml, findlib, ocamlbuild, ounit }:
 
+let
+  # ounit is only available for OCaml >= 4.04
+  doCheck = lib.versionAtLeast ocaml.version "4.04";
+in
+
 stdenv.mkDerivation {
   pname = "ocamlmod";
   version = "0.0.9";
@@ -9,13 +14,15 @@ stdenv.mkDerivation {
     sha256 = "0cgp9qqrq7ayyhddrmqmq1affvfqcn722qiakjq4dkywvp67h4aa";
   };
 
-  buildInputs = [ ocaml findlib ocamlbuild ounit ];
+  buildInputs = [ ocaml findlib ocamlbuild ];
 
-  configurePhase = "ocaml setup.ml -configure --prefix $out --enable-tests";
+  configurePhase = "ocaml setup.ml -configure --prefix $out"
+    + lib.optionalString doCheck " --enable-tests";
   buildPhase     = "ocaml setup.ml -build";
   installPhase   = "ocaml setup.ml -install";
 
-  doCheck = true;
+  inherit doCheck;
+  checkInputs = [ ounit ];
 
   checkPhase = "ocaml setup.ml -test";