libsForQt5.extra-cmake-modules: fix for strictDeps (#376831)

pkgs/development/libraries/kde-frameworks/extra-cmake-modules/default.nix

@@ -2,6 +2,7 @@
   mkDerivation,
   lib,
   fetchpatch,
+  bash,
   cmake,
   pkg-config,
 }:
@@ -19,11 +20,22 @@ mkDerivation {
 
   outputs = [ "out" ]; # this package has no runtime components
 
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  buildInputs = [
+    bash
+  ];
+
+  # note: these will be propagated into the same list extra-cmake-modules is in
   propagatedBuildInputs = [
     cmake
     pkg-config
   ];
 
+  strictDeps = true;
+
   setupHook = ./setup-hook.sh;
 
   meta = with lib; {

pkgs/development/libraries/kde-frameworks/extra-cmake-modules/setup-hook.sh

@@ -1,3 +1,9 @@
+ecmCMakeFlags() {
+    appendToVar cmakeFlags "-DECM_DIR=@out@/share/ECM/cmake"
+}
+
+preConfigureHooks+=(ecmCMakeFlags)
+
 ecmEnvHook() {
     addToSearchPath XDG_DATA_DIRS "$1/share"
     addToSearchPath XDG_CONFIG_DIRS "$1/etc/xdg"