From 50bf68669a9a362422660288c4357a1d4af60119 Mon Sep 17 00:00:00 2001
From: Cole Helbling <cole.e.helbling@outlook.com>
Date: Fri, 21 Aug 2020 13:57:25 -0700
Subject: [PATCH] dfhack: fix ruby plugin

dfhack expects an unversioned libruby.so to be present in the hack
subdirectory for ruby plugins to function. The glob is necessary,
because the ruby package's library names are formatted as
ruby-${version}.so for whatever reason. The glob makes it possible for
ruby to update without manual intervention being needed here.
---
 pkgs/games/dwarf-fortress/dfhack/default.nix | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkgs/games/dwarf-fortress/dfhack/default.nix b/pkgs/games/dwarf-fortress/dfhack/default.nix
index 03ce8a285ab..11c21b82c29 100644
--- a/pkgs/games/dwarf-fortress/dfhack/default.nix
+++ b/pkgs/games/dwarf-fortress/dfhack/default.nix
@@ -1,5 +1,5 @@
 { stdenv, buildEnv, lib, fetchFromGitHub, cmake, writeScriptBin
-, perl, XMLLibXML, XMLLibXSLT, zlib
+, perl, XMLLibXML, XMLLibXSLT, zlib, ruby
 , enableStoneSense ? false,  allegro5, libGLU, libGL
 , enableTWBT ? true, twbt
 , SDL
@@ -140,6 +140,12 @@ let
     cmakeFlags = [ "-DDFHACK_BUILD_ARCH=${arch}" "-DDOWNLOAD_RUBY=OFF" ]
               ++ lib.optionals enableStoneSense [ "-DBUILD_STONESENSE=ON" "-DSTONESENSE_INTERNAL_SO=OFF" ];
 
+    # dfhack expects an unversioned libruby.so to be present in the hack
+    # subdirectory for ruby plugins to function.
+    postInstall = ''
+      ln -s ${ruby}/lib/libruby-*.so $out/hack/libruby.so
+    '';
+
     enableParallelBuilding = true;
   };
 in