diff --git a/pkgs/games/pokerth/default.nix b/pkgs/games/pokerth/default.nix
index 9daf98dcfb4f..e34f05402f77 100644
--- a/pkgs/games/pokerth/default.nix
+++ b/pkgs/games/pokerth/default.nix
@@ -19,6 +19,8 @@ in stdenv.mkDerivation rec {
 
   qmakeFlags = [ "pokerth.pro" ];
 
+  NIX_CFLAGS_COMPILE = [ "-I${SDL.dev}/include/SDL" ];
+
   postPatch = ''
     for f in connectivity.pro load.pro pokerth_game.pro pokerth_server.pro
     do
@@ -27,6 +29,8 @@ in stdenv.mkDerivation rec {
     done
   '';
 
+  enableParallelBuilding = true;
+
   postInstall = ''
     install -D -m755 bin/pokerth_server $server/bin/pokerth_server
   '';