From 6841ebc31d1d2773f2d9997f877d05ef66494dc9 Mon Sep 17 00:00:00 2001
From: Vir Chaudhury <virchau13@hexular.net>
Date: Mon, 18 Jul 2022 17:53:24 +0800
Subject: [PATCH] fix(nix): only load stdenv.cc.cc.lib on NixOS

On non-NixOS, launching any external process from Minecraft (e.g.
clicking on links) will fail due to a conflict between the system
libraries and the Nix stdenv.cc.cc.lib. This works around that issue by
only loading stdenv.cc.cc.lib on NixOS.

Signed-off-by: Vir Chaudhury <virchau13@hexular.net>
---
 nix/default.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/nix/default.nix b/nix/default.nix
index 12ac0165..1a6b9e44 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -34,7 +34,6 @@ let
     libXxf86vm
     libpulseaudio
     libGL
-    stdenv.cc.cc.lib
   ];
 
   # This variable will be passed to Minecraft by PolyMC
@@ -68,10 +67,12 @@ stdenv.mkDerivation rec {
   ] ++ lib.optionals enableLTO [ "-DENABLE_LTO=on" ]
     ++ lib.optionals (msaClientID != "") [ "-DLauncher_MSA_CLIENT_ID=${msaClientID}" ];
 
+  # we have to check if the system is NixOS before adding stdenv.cc.cc.lib (#923)
   postInstall = ''
     # xorg.xrandr needed for LWJGL [2.9.2, 3) https://github.com/LWJGL/lwjgl/issues/128
     wrapQtApp $out/bin/polymc \
-      --set GAME_LIBRARY_PATH ${gameLibraryPath} \
+      --run '[ -f /etc/NIXOS ] && export GAME_LIBRARY_PATH="${stdenv.cc.cc.lib}/lib"' \
+      --prefix GAME_LIBRARY_PATH : ${gameLibraryPath} \
       --prefix POLYMC_JAVA_PATHS : ${javaPaths} \
       --prefix PATH : ${lib.makeBinPath [ xorg.xrandr ]}
   '';