Split nix file, and fix GLX error

Author: jiegec

default.nix

@@ -1,22 +1,3 @@
 with import <nixpkgs> {};
 
-stdenv.mkDerivation {
-  name = "QSerial";
-  version = "1.1";
-
-  src = ./.;
-
-  nativeBuildInputs = [
-    cmake
-    pkgconfig
-    libsForQt5.wrapQtAppsHook
-  ];
-
-  buildInputs = [
-    libsForQt5.qt5.qtbase
-    libsForQt5.qt5.qtserialport
-    libsForQt5.qt5.qtwebengine
-    libusb1
-  ];
-}
-
+libsForQt5.callPackage ./qserial.nix { }

qserial.nix

@@ -0,0 +1,28 @@
+{ stdenv, qtbase, qtserialport, qtwebengine, wrapQtAppsHook, cmake, pkgconfig, libusb1 }:
+
+stdenv.mkDerivation {
+  name = "QSerial";
+  version = "1.1";
+
+  src = ./.;
+
+  nativeBuildInputs = [
+    cmake
+    pkgconfig
+    wrapQtAppsHook
+  ];
+
+  buildInputs = [
+    qtbase
+    qtserialport
+    qtwebengine
+    libusb1
+  ];
+ 
+  # https://github.com/NixOS/nixpkgs/issues/66755#issuecomment-657305962
+  # Fix "Could not initialize GLX" error
+  postInstall = ''
+    wrapProgram "$out/bin/QSerial" --set QT_XCB_GL_INTEGRATION none
+  '';
+}
+