kirigami: add pre-release v2

It requires qt5.7

pkgs/development/libraries/kirigami/v2.nix

@@ -0,0 +1,23 @@
+{ stdenv, fetchurl, cmake, ecm, pkgconfig, plasma-framework, qtbase, qtquickcontrols2 }:
+
+stdenv.mkDerivation rec {
+  pname = "kirigami";
+  version = "1.90.0";
+  name = "${pname}2-${version}";
+
+  src = fetchurl {
+    url = "mirror://kde/unstable/${pname}/${pname}-${version}.tar.xz";
+    sha256 = "a5ca094a60d1cc48116cbed07bbe68be016773d2488a91e278859c90f59e64a8";
+  };
+
+  buildInputs = [ qtbase qtquickcontrols2 plasma-framework ];
+
+  nativeBuildInputs = [ cmake pkgconfig ecm ];
+
+  meta = with stdenv.lib; {
+    license = licenses.lgpl2;
+    homepage = http://www.kde.org;
+    maintainers = with maintainers; [ ttuegel peterhoeg ];
+    platforms = platforms.unix;
+  };
+}

pkgs/development/libraries/qt-5/5.7/default.nix

@@ -82,6 +82,7 @@ let
         inherit (pkgs.gst_all_1) gstreamer gst-plugins-base;
       };
       qtquickcontrols = callPackage ./qtquickcontrols.nix {};
+      qtquickcontrols2 = callPackage ./qtquickcontrols2.nix {};
       qtscript = callPackage ./qtscript {};
       qtsensors = callPackage ./qtsensors.nix {};
       qtserialport = callPackage ./qtserialport {};

pkgs/development/libraries/qt-5/5.7/qtquickcontrols2.nix

@@ -0,0 +1,6 @@
+{ qtSubmodule, qtdeclarative }:
+
+qtSubmodule {
+  name = "qtquickcontrols2";
+  qtInputs = [ qtdeclarative ];
+}

pkgs/top-level/all-packages.nix

@@ -9082,7 +9082,14 @@ in
 
     grantlee = callPackage ../development/libraries/grantlee/5.x.nix { };
 
-    kirigami = callPackage ../development/libraries/kirigami { };
+    kirigami_1 = callPackage ../development/libraries/kirigami { };
+
+    kirigami_2 = callPackage ../development/libraries/kirigami/v2.nix {
+      # kirigami v2 requires qt 5.7 and above
+      inherit (qt57) qtbase qtquickcontrols2;
+    };
+
+    kirigami = kirigami_1;
 
     libcommuni = callPackage ../development/libraries/libcommuni { };