awesomebump: fix parallel building

pkgs/applications/graphics/awesomebump/default.nix

@@ -15,6 +15,7 @@ let
     name = "qtnproperty";
     inherit src;
     sourceRoot = "AwesomeBump/Sources/utils/QtnProperty";
+    patches = [ ./qtnproperty-parallel-building.patch ];
     buildInputs = [ qtscript qtbase qtdeclarative ];
     nativeBuildInputs = [ qmake flex bison ];
     postInstall = ''
@@ -46,6 +47,10 @@ in stdenv.mkDerivation rec {
         --run "cd $d"
   '';
 
+  passthru = {
+    inherit qtnproperty;
+  };
+
   meta = {
     homepage = https://github.com/kmkolasinski/AwesomeBump;
     description = "A program to generate normal, height, specular or ambient occlusion textures from a single image";

pkgs/applications/graphics/awesomebump/qtnproperty-parallel-building.patch

@@ -0,0 +1,9 @@
+--- a/PEG/Flex.pri
++++ b/PEG/Flex.pri
+@@ -1,5 +1,6 @@
+ flex.name = Flex ${QMAKE_FILE_IN}
+ flex.input = FLEX_SOURCES
++flex.depends = ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}.parser.cpp
+ flex.output = ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}.lexer.cpp
+ 
+ win32:flex.commands = win_flex --wincompat -o ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}.lexer.cpp ${QMAKE_FILE_IN}