From f6e07b3c5df3589a27005e90bacb4a1851ec23cf Mon Sep 17 00:00:00 2001
From: Joe Hermaszewski <git@monoid.al>
Date: Fri, 19 Jun 2020 13:27:21 +0800
Subject: [PATCH] defaultGemConfig.mathematical: fix cross compilation

---
 .../ruby-modules/gem-config/default.nix           | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 65f27f497b7f8f..9ccc369429df5d 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -305,19 +305,26 @@ in
   };
 
   mathematical = attrs: {
-    buildInputs = [
+    nativeBuildInputs = [
+      ruby
       cmake
       bison
       flex
-      glib
       pkgconfig
+      python3
+    ];
+
+    buildInputs = [
       cairo
-      pango
+      fribidi
       gdk-pixbuf
+      glib
       libxml2
-      python3
+      pango
     ];
 
+    strictDeps = true;
+
     # The ruby build script takes care of this
     dontUseCmakeConfigure = true;