Some qt notes

ExampleDependencies/CMakeLists.txt

@@ -33,6 +33,7 @@ find_package(ManiVault COMPONENTS Core PointData CONFIG)
 find_package(blake3 CONFIG REQUIRED)
 
 if(NOT APPLE)
+    find_package(lapack CONFIG REQUIRED)    # only for backwards-compatability with cmake < 3.21
     find_package(faiss CONFIG REQUIRED)
 endif()
 

conanfile.py

@@ -97,9 +97,17 @@ def generate(self):
         tc.variables["CMAKE_CXX_STANDARD_REQUIRED"] = "ON"
 
         # Use the Qt provided .cmake files
-        qtpath = pathlib.Path(self.deps_cpp_info["qt"].rootpath)
-        qt_root = str(list(qtpath.glob("**/Qt6Config.cmake"))[0].parents[3].as_posix())
-        tc.variables["CMAKE_PREFIX_PATH"] = qt_root
+        qt_path = pathlib.Path(self.deps_cpp_info["qt"].rootpath)
+        qt_cfg = list(qt_path.glob("**/Qt6Config.cmake"))[0]
+        qt_root = str(qt_cfg.parents[0].as_posix()) 
+        qt_dir = str(qt_cfg.parents[3].as_posix())
+
+        # for Qt >= 6.4.2
+        #print("Qt6_DIR: ", qt_root)
+        #tc.variables["Qt6_DIR"] = qt_root
+
+        # for Qt < 6.4.2
+        tc.variables["CMAKE_PREFIX_PATH"] = qt_dir
 
         # Set the installation directory for ManiVault based on the MV_INSTALL_DIR environment variable
         # or if none is specified, set it to the build/install dir.
@@ -114,7 +122,7 @@ def generate(self):
 
         # Set some build options
         tc.variables["MV_UNITY_BUILD"] = "ON"
-        
+
         # Install vcpkg dependencies
         vcpkg_dir = os.environ["VCPKG_ROOT"]
         vcpkg_exe = os.path.join(vcpkg_dir, "vcpkg.exe") if self.settings.os == "Windows" else os.path.join(vcpkg_dir, "vcpkg")