Update to handle newer Qt versions

Author: kovzol

README.md

@@ -29,9 +29,13 @@ Clone/Download the repository. For example:
    ```
    git clone https://github.com/kovzol/aris
    ```
+You may need to install additional software like `cmake`, Qt, `ninja`, and of course, you need to have
+a working C/C++ compiler toolchain.
 
 ### gtk version
 
+#### Linux or Mac
+
 1. Follow the steps:
 ```
 mkdir build
@@ -67,7 +71,17 @@ cmake ..
 
 4. Launch using `./aris`.
 
-For further instructions on building and installation ( without `cmake`), refer to the [INSTALL](INSTALL) file.
+For further instructions on building and installation (without `cmake`), refer to the [INSTALL](INSTALL) file.
+
+##### Windows (with MINGW)
+
+Run the following inside `aris/`:
+```
+mkdir build
+cd build
+cmake -G "MinGW Makefiles" ..
+mingw32-make -j4
+```
 
 #### Snap Installation
 
@@ -77,11 +91,14 @@ To install GNU Aris through snap, visit https://snapcraft.io/aris and find the r
 #### Using `cmake`
 
 ##### Linux
-Run the following inside `aris/` :
+Run the following inside `aris/`:
 ```
 cmake -S qt/ -B build-qt/ -DCMAKE_GENERATOR:STRING=Ninja -DCMAKE_BUILD_TYPE:STRING=Release
 cmake --build build-qt/ --target all
 ```
+(In case Qt is installed in a non-system folder, add `-DCMAKE_PREFIX_PATH=...` to the first command line.
+See https://stackoverflow.com/a/66457331 for more information.)
+
 This should generate a binary `aris-qt` inside `build-qt/` , it can be run with `./aris-qt` or you can install to `/usr/local` with:
 ```
 cd build-qt/ && cmake -P cmake_install.cmake
@@ -91,15 +108,6 @@ To uninstall:
 cd build-qt/ && xargs rm < install_manifest.txt
 ```
 
-##### Windows (with MINGW)
-
-Run the following inside `aris/`:
-```
-mkdir build
-cd build
-cmake -G "MinGW Makefiles" ..
-mingw32-make -j4
-```
 
 #### Using `qmake`
 

qt/CMakeLists.txt

@@ -6,7 +6,8 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 add_compile_definitions(WITH_CMAKE)
 
-find_package(Qt6 6.2 REQUIRED COMPONENTS Quick Widgets QuickControls2)
+find_package(Qt6 REQUIRED COMPONENTS Quick Widgets QuickControls2)
+set(Qt6_FIND_VERSION_MIN 6.0)
 find_package(LibXml2 REQUIRED)
 
 add_executable(aris-qt