phonon: fix evaluation error

pkgs/development/libraries/phonon/default.nix

@@ -0,0 +1,54 @@
+{ stdenv, fetchurl, cmake, mesa, pkgconfig, libpulseaudio
+, qt4 ? null, automoc4 ? null
+, qtbase ? null, qtquick1 ? null, qttools ? null
+, debug ? false }:
+
+with stdenv.lib;
+
+let
+  v = "4.8.3";
+  withQt5 = qtbase != null;
+in
+
+assert withQt5 -> qtquick1 != null;
+assert withQt5 -> qttools != null;
+assert !withQt5 -> automoc4 != null;
+
+stdenv.mkDerivation rec {
+  name = "phonon-${v}";
+
+  meta = {
+    homepage = http://phonon.kde.org/;
+    description = "Multimedia API for Qt";
+    license = stdenv.lib.licenses.lgpl2;
+    platforms = stdenv.lib.platforms.linux;
+    maintainers = with stdenv.lib.maintainers; [ ttuegel ];
+  };
+
+  src = fetchurl {
+    url = "mirror://kde/stable/phonon/${v}/src/phonon-${v}.tar.xz";
+    sha256 = "05nshngk03ln90vsjz44dx8al576f4vd5fvhs1l0jmx13jb9q551";
+  };
+
+  buildInputs =
+    [ mesa libpulseaudio ]
+    ++ (if withQt5 then [ qtbase qtquick1 qttools ] else [ qt4 ]);
+
+  nativeBuildInputs =
+    [ cmake pkgconfig ]
+    ++ optional (!withQt5) automoc4;
+
+  NIX_CFLAGS_COMPILE = "-fPIC";
+
+  cmakeFlags =
+    [ "-DCMAKE_BUILD_TYPE=${if debug then "Debug" else "Release"}" ]
+    ++ optional withQt5 "-DPHONON_BUILD_PHONON4QT5=ON";
+
+  postPatch = ''
+    sed -i PhononConfig.cmake.in \
+        -e "/get_filename_component(rootDir/ s/^.*$//" \
+        -e "s,\\(set(PHONON_INCLUDE_DIR\\).*$,\\1 \"''${!outputDev}/include\")," \
+        -e "s,\\(set(PHONON_LIBRARY_DIR\\).*$,\\1 \"''${!outputLib}/lib\")," \
+        -e "s,\\(set(PHONON_BUILDSYSTEM_DIR\\).*$,\\1 \"''${!outputDev}/share/phonon${if withQt5 then "4qt5" else ""}/buildsystem\"),"
+  '';
+}