From c341f56928c5f8a41baf11d578c92b4cb7d77c6a Mon Sep 17 00:00:00 2001
From: markuskowa <markus.kowalewski@gmail.com>
Date: Tue, 30 Oct 2018 16:15:53 +0100
Subject: [PATCH] virtualgl-lib: fix broken startup script (#49185)

Replace /bin/sh with bash in vglrun.
'exec' fails with /bin/sh

(cherry picked from commit efd3f8b57ff81f263a961c740396b4eb205aa955)
---
 pkgs/tools/X11/virtualgl/lib.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/tools/X11/virtualgl/lib.nix b/pkgs/tools/X11/virtualgl/lib.nix
index c552011f3844..5446a51fc0a1 100644
--- a/pkgs/tools/X11/virtualgl/lib.nix
+++ b/pkgs/tools/X11/virtualgl/lib.nix
@@ -19,6 +19,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  postPatch = ''
+    # script calls exec, which fails with plain sh
+    substituteInPlace ./server/vglrun.in \
+      --replace '#!/bin/sh' '#!/usr/bin/env bash'
+  '';
+
   meta = with stdenv.lib; {
     homepage = http://www.virtualgl.org/;
     description = "X11 GL rendering in a remote computer with full 3D hw acceleration";