From a720bc44c23c80a49dab05c7907c2e58681b425d Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Wed, 1 Jun 2022 21:13:44 +0300
Subject: [PATCH] buildRubyGem: fix bundix cross

allows building bundix but most ruby gems still fail with

```
++ gem install --local --force --http-proxy http://nodtd.invalid --ignore-dependencies --install-dir /nix/store/...-ruby-aarch64-unknown-linux-gnu2.7.6-nio4r-2.5.8-aarch64-unknown-linux-gnu/lib/ruby/gems/2.7.0
--build-root / --backtrace --no-env-shebang -N /nix/store/...-nio4r-2.5.8.gem --
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 8: require: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 9: require: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 10: require: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 12: required_version: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 14: unless: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 15: abort: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 16: end: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 18: args: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 20: begin: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 21: Gem::GemRunner.new.run: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 22: rescue: command not found
/nix/store/...-ruby-aarch64-unknown-linux-gnu-2.7.6/bin/gem: line 23: exit: e.exit_code: numeric argument required
```
---
 pkgs/development/ruby-modules/gem/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/ruby-modules/gem/default.nix b/pkgs/development/ruby-modules/gem/default.nix
index 7ba8c70a9805..649d33c46461 100644
--- a/pkgs/development/ruby-modules/gem/default.nix
+++ b/pkgs/development/ruby-modules/gem/default.nix
@@ -35,6 +35,7 @@ lib.makeOverridable (
 , namePrefix ? (let
     rubyName = builtins.parseDrvName ruby.name;
   in "${rubyName.name}${rubyName.version}-")
+, nativeBuildInputs ? []
 , buildInputs ? []
 , meta ? {}
 , patches ? []
@@ -87,11 +88,15 @@ stdenv.mkDerivation ((builtins.removeAttrs attrs ["source"]) // {
   inherit dontStrip;
   inherit type;
 
-  buildInputs = [
+  nativeBuildInputs = [
     ruby makeWrapper
   ] ++ lib.optionals (type == "git") [ gitMinimal ]
     ++ lib.optionals (type != "gem") [ bundler ]
-    ++ lib.optional stdenv.isDarwin darwin.libobjc
+    ++ nativeBuildInputs;
+
+  buildInputs = [
+    ruby
+  ] ++ lib.optionals stdenv.isDarwin [ darwin.libobjc ]
     ++ buildInputs;
 
   #name = builtins.trace (attrs.name or "no attr.name" ) "${namePrefix}${gemName}-${version}";