kdePackages.kirigami: hack to propagate qqc2-desktop-style

pkgs/kde/frameworks/kirigami/default.nix

@@ -1,14 +1,34 @@
 {
+  stdenv,
   mkKdeDerivation,
   qtsvg,
   qttools,
   qtdeclarative,
   qt5compat,
+  qqc2-desktop-style,
 }:
-mkKdeDerivation {
+# Kirigami has a runtime dependency on qqc2-desktop-style,
+# which has a build time dependency on Kirigami.
+# So, build qqc2-desktop-style against unwrapped Kirigami,
+# and replace all the other Kirigami with a wrapper that
+# propagates both Kirigami and qqc2-desktop-style.
+# This is a hack, but what can you do.
+let
+  unwrapped = mkKdeDerivation {
     pname = "kirigami";
 
     extraNativeBuildInputs = [qtsvg qttools];
     extraBuildInputs = [qtdeclarative];
     extraPropagatedBuildInputs = [qt5compat];
+  };
+in stdenv.mkDerivation {
+  pname = "kirigami-wrapped";
+  inherit (unwrapped) version;
+
+  propagatedBuildInputs = [ unwrapped qqc2-desktop-style ];
+
+  dontUnpack = true;
+  dontWrapQtApps = true;
+
+  passthru = { inherit unwrapped; };
 }

pkgs/kde/frameworks/qqc2-desktop-style/default.nix

@@ -2,10 +2,13 @@
   mkKdeDerivation,
   qtdeclarative,
   qttools,
+  kirigami,
 }:
 mkKdeDerivation {
   pname = "qqc2-desktop-style";
 
   extraNativeBuildInputs = [qttools];
-  extraBuildInputs = [qtdeclarative];
+  extraBuildInputs = [qtdeclarative kirigami.unwrapped];
+
+  excludeDependencies = ["kirigami"];
 }