From 458b2cb7d67561c796c6f0660a97eea9b685fc65 Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Thu, 4 Jun 2020 15:24:25 +0200
Subject: [PATCH] bison_3_5: init at 3.5.4, for ruby

Ruby does not build with 3.6. To unblock staging-next, let it use the
previous bison version.
---
 pkgs/top-level/all-packages.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 092b44bf984..f8b7b6d4a61 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9794,6 +9794,7 @@ in
   inherit (callPackage ../development/interpreters/ruby {
     inherit (darwin) libiconv libobjc libunwind;
     inherit (darwin.apple_sdk.frameworks) Foundation;
+    bison = bison_3_5;
   })
     ruby_2_5
     ruby_2_6
@@ -10124,6 +10125,15 @@ in
   bison = callPackage ../development/tools/parsing/bison { };
   yacc = bison; # TODO: move to aliases.nix
 
+  # Ruby fails to build with current bison
+  bison_3_5 = pkgs.bison.overrideAttrs (oldAttrs: rec {
+    version = "3.5.4";
+    src = fetchurl {
+      url = "mirror://gnu/${oldAttrs.pname}/${oldAttrs.pname}-${version}.tar.gz";
+      sha256 = "0a2cbrqh7mgx2dwf5qm10v68iakv1i0dqh9di4x5aqxsz96ibpf0";
+    };
+  });
+
   black = with python3Packages; toPythonApplication black;
 
   blackmagic = callPackage ../development/tools/misc/blackmagic { };