From b0c181bc9d1d86928192cc87f97c743b444f35a5 Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Wed, 2 Dec 2020 12:53:55 +0100
Subject: [PATCH] ocamlPackages.astring: 0.8.3 -> 0.8.5

Since astring is a common dependency and the maintainance effort is
minimal (package dependencies and build system didn't change) we keep
the old 0.8.3 version around for OCaml < 4.05, since 0.8.4 requires a
minimum of OCaml 4.05.
---
 .../ocaml-modules/astring/default.nix         | 23 +++++++++++++++----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/pkgs/development/ocaml-modules/astring/default.nix b/pkgs/development/ocaml-modules/astring/default.nix
index b6360160891..f790a87e22c 100644
--- a/pkgs/development/ocaml-modules/astring/default.nix
+++ b/pkgs/development/ocaml-modules/astring/default.nix
@@ -1,12 +1,25 @@
 { stdenv, fetchurl, ocaml, findlib, ocamlbuild, topkg }:
 
-stdenv.mkDerivation rec {
-  version = "0.8.3";
-  name = "ocaml${ocaml.version}-astring-${version}";
+let
+  # Use astring 0.8.3 for OCaml < 4.05
+  param =
+    if stdenv.lib.versionAtLeast ocaml.version "4.05"
+    then {
+      version = "0.8.5";
+      sha256 = "1ykhg9gd3iy7zsgyiy2p9b1wkpqg9irw5pvcqs3sphq71iir4ml6";
+    } else {
+      version = "0.8.3";
+      sha256 = "0ixjwc3plrljvj24za3l9gy0w30lsbggp8yh02lwrzw61ls4cri0";
+    };
+in
+
+stdenv.mkDerivation {
+  name = "ocaml${ocaml.version}-astring-${param.version}";
+  inherit (param) version;
 
   src = fetchurl {
-    url = "https://erratique.ch/software/astring/releases/astring-${version}.tbz";
-    sha256 = "0ixjwc3plrljvj24za3l9gy0w30lsbggp8yh02lwrzw61ls4cri0";
+    url = "https://erratique.ch/software/astring/releases/astring-${param.version}.tbz";
+    inherit (param) sha256;
   };
 
   buildInputs = [ ocaml findlib ocamlbuild topkg ];