From 462c43881a4a74932c403005b501d7243c6a131b Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Mon, 17 Jun 2019 16:00:42 +0000
Subject: [PATCH] merkaartor: fix run-time loading of Qt 5 platform
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Without this patch, running merkaartor fails with the following message:
“This application failed to start because it could not find or load the Qt
platform plugin "xcb"”.
---
 pkgs/applications/misc/merkaartor/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/applications/misc/merkaartor/default.nix b/pkgs/applications/misc/merkaartor/default.nix
index 70a6efb90dd..0833464f2c2 100644
--- a/pkgs/applications/misc/merkaartor/default.nix
+++ b/pkgs/applications/misc/merkaartor/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, qmake, pkgconfig, boost, gdal, proj
+{ stdenv, fetchFromGitHub, makeWrapper, qmake, pkgconfig, boost, gdal, proj
 , qtbase, qtsvg, qtwebkit }:
 
 stdenv.mkDerivation rec {
@@ -12,12 +12,17 @@ stdenv.mkDerivation rec {
     sha256 = "0ls3q8m1hxiwyrypy6qca8wczhl4969ncl0sszfdwfv70rzxjk88";
   };
 
-  nativeBuildInputs = [ qmake pkgconfig ];
+  nativeBuildInputs = [ makeWrapper qmake pkgconfig ];
 
   buildInputs = [ boost gdal proj qtbase qtsvg qtwebkit ];
 
   enableParallelBuilding = true;
 
+  postInstall = ''
+    wrapProgram $out/bin/merkaartor \
+      --set QT_QPA_PLATFORM_PLUGIN_PATH ${qtbase.bin}/lib/qt-*/plugins/platforms
+  '';
+
   meta = with stdenv.lib; {
     description = "OpenStreetMap editor";
     homepage = http://merkaartor.be/;