From 14ec3c0a82dc8e08effa12ae5a56cd63be036b1f Mon Sep 17 00:00:00 2001
From: Peter Hoeg <peter@hoeg.com>
Date: Sun, 27 Jun 2021 13:38:33 +0800
Subject: [PATCH] gemrb: vlc is only needed on mac

---
 pkgs/games/gemrb/default.nix | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/pkgs/games/gemrb/default.nix b/pkgs/games/gemrb/default.nix
index 77c9c7adaf9f..947957bc3af6 100644
--- a/pkgs/games/gemrb/default.nix
+++ b/pkgs/games/gemrb/default.nix
@@ -20,6 +20,10 @@ let
   backend =
     if (stdenv.isx86_32 || stdenv.isx86_64) then "OpenGL" else "GLES";
 
+  withVLC = stdenv.isDarwin;
+
+  inherit (lib) optional optionalString;
+
 in
 stdenv.mkDerivation rec {
   pname = "gemrb";
@@ -39,19 +43,23 @@ stdenv.mkDerivation rec {
     libGL
     libiconv
     libpng
-    libvlc
     libvorbis
     openal
     python2
     zlib
-  ];
+  ]
+  ++ optional withVLC libvlc;
 
   nativeBuildInputs = [ cmake ];
 
-  LIBVLC_INCLUDE_PATH = "${lib.getDev libvlc}/include";
-  LIBVLC_LIBRARY_PATH = "${lib.getLib libvlc}/lib";
+  # libvlc isn't being detected properly as of 0.9.0, so set it
+  LIBVLC_INCLUDE_PATH = optionalString withVLC "${lib.getDev libvlc}/include";
+  LIBVLC_LIBRARY_PATH = optionalString withVLC "${lib.getLib libvlc}/lib";
 
   cmakeFlags = [
+    "-DDATA_DIR=${placeholder "out"}/share/gemrb"
+    "-DEXAMPLE_CONF_DIR=${placeholder "out"}/share/doc/gemrb/examples"
+    "-DSYSCONF_DIR=/etc"
     # use the Mesa drivers for video on ARM (harmless on x86)
     "-DDISABLE_VIDEOCORE=ON"
     "-DLAYOUT=opt"