From 91745d869ef4a3ce50027e712deeb1173b4376f7 Mon Sep 17 00:00:00 2001
From: Otavio Salvador <otavio@ossystems.com.br>
Date: Wed, 20 May 2026 18:58:21 -0300
Subject: [PATCH] ruby/gem-config: add prawn-gmagick

prawn-gmagick is a Prawn extension that uses GraphicsMagick to embed image
formats Prawn's built-in code does not understand (notably WebP). The gem
ships a C extension that links against libGraphicsMagick via pkg-config, so
graphicsmagick and pkg-config must be in scope at build time.
---
 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 3cf941cdca06..5f39b10a5f47 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -892,6 +892,11 @@ in
     buildFlags = [ "--without-imlib2-config" ];
   };
 
+  prawn-gmagick = attrs: {
+    buildInputs = [ graphicsmagick ];
+    nativeBuildInputs = [ pkg-config ];
+  };
+
   psych = attrs: {
     buildInputs = [ libyaml ];
   };