From 33ed801e7385772d9e71f2df33cc60709711259e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stanis=C5=82aw=20Pitucha?= <stan.pitucha@envato.com>
Date: Sat, 18 Feb 2023 00:14:45 +1100
Subject: [PATCH] rubyPackages.eventmachine: fix darwin build

This fixes the build of mailcatcher (and maybe others).

Fixes:
```
em.cpp:1232:40: error: invalid operands to binary expression ('__bind<int &, sockaddr *&, int &>' and 'int')
                if (bind (sd, bind_to, bind_to_size) < 0) {
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
```
Where `bind` is treated as `std::bind` rather than `::bind` in newer C++
standards.
---
 pkgs/development/ruby-modules/gem-config/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 9f2e8dbfcd11..06516ab2fba9 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -203,7 +203,12 @@ in
   };
 
   eventmachine = attrs: {
+    dontBuild = false;
     buildInputs = [ openssl ];
+    postPatch = ''
+      substituteInPlace ext/em.cpp \
+        --replace 'if (bind (' 'if (::bind ('
+    '';
   };
 
   exif = attrs: {