From aa8b17baf32467031e2265cf57be77f852d8af1b Mon Sep 17 00:00:00 2001
From: Ivan Trubach <mr.trubach@icloud.com>
Date: Mon, 3 Jun 2024 21:14:44 +0300
Subject: [PATCH] buildRubyGem: do not patch shebangs in non-existent directory

---
 pkgs/development/ruby-modules/gem/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/ruby-modules/gem/default.nix b/pkgs/development/ruby-modules/gem/default.nix
index 2ddbcffd18de..2e280364cfcc 100644
--- a/pkgs/development/ruby-modules/gem/default.nix
+++ b/pkgs/development/ruby-modules/gem/default.nix
@@ -258,7 +258,9 @@ stdenv.mkDerivation ((builtins.removeAttrs attrs ["source"]) // {
   # store.
   fixupPhase = attrs.fixupPhase or ''
     runHook preFixup
-    patchShebangs --update --host $out/${ruby.gemPath}/bin
+    if [[ -d $out/${ruby.gemPath}/bin ]]; then
+      patchShebangs --update --host $out/${ruby.gemPath}/bin
+    fi
     runHook postFixup
   '';