qt6Packages.qtkeychain: allow building with qt6

pkgs/development/libraries/qtkeychain/default.nix

@@ -1,11 +1,18 @@
-{ lib, stdenv, fetchFromGitHub, cmake, pkg-config, qtbase, qttools
-, CoreFoundation, Security
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, pkg-config
+, qtbase
+, qttools
+, CoreFoundation
+, Security
 , libsecret
 }:
 
 stdenv.mkDerivation rec {
   pname = "qtkeychain";
-  version = "0.12.0";            # verify after nix-build with `grep -R "set(PACKAGE_VERSION " result/`
+  version = "0.12.0";
 
   src = fetchFromGitHub {
     owner = "frankosterfeld";
@@ -18,7 +25,10 @@ stdenv.mkDerivation rec {
 
   patches = [ ./0002-Fix-install-name-Darwin.patch ];
 
-  cmakeFlags = [ "-DQT_TRANSLATIONS_DIR=share/qt/translations" ];
+  cmakeFlags = [
+    "-DBUILD_WITH_QT6=${if lib.versions.major qtbase.version == "6" then "ON" else "OFF"}"
+    "-DQT_TRANSLATIONS_DIR=share/qt/translations"
+  ];
 
   nativeBuildInputs = [ cmake ]
     ++ lib.optionals (!stdenv.isDarwin) [ pkg-config ] # for finding libsecret
@@ -27,9 +37,22 @@ stdenv.mkDerivation rec {
   buildInputs = lib.optionals (!stdenv.isDarwin) [ libsecret ]
     ++ [ qtbase qttools ]
     ++ lib.optionals stdenv.isDarwin [
-      CoreFoundation Security
-    ]
-  ;
+    CoreFoundation
+    Security
+  ];
+
+  doInstallCheck = true;
+
+  # we previously had a note in here saying to run this check manually, so we might as
+  # well do it automatically. It seems like a perfectly valid sanity check, but I
+  # have no idea *why* we might need it
+  installCheckPhase = ''
+    runHook preInstallCheck
+
+    grep --quiet -R 'set(PACKAGE_VERSION "${version}"' .
+
+    runHook postInstallCheck
+  '';
 
   meta = {
     description = "Platform-independent Qt API for storing passwords securely";

pkgs/top-level/qt6-packages.nix

@@ -31,6 +31,10 @@ in
 
   inherit (kdeFrameworks) kcoreaddons;
 
+  qtkeychain = callPackage ../development/libraries/qtkeychain {
+    inherit (pkgs.darwin.apple_sdk.frameworks) CoreFoundation Security;
+  };
+
   qtpbfimageplugin = callPackage ../development/libraries/qtpbfimageplugin { };
 
   quazip = callPackage ../development/libraries/quazip { };