不能在ubuntu上用QT6构建CMake

Question

我正在尝试手动设置一个在Ubuntu20.04LTS上使用QT6的QT6项目。这就是CMakeLists.txt的样子：

cmake_minimum_required(VERSION 3.16)

project(Button, LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)

set(CMAKE_PREFIX_PATH "home/ilmu011/Qt/6.2.3/gcc64")

find_package(Qt6 REQUIRED COMPONENTS Widgets)

add_executable(Button
main.cpp
)

但是，CMake声明它没有找到QT6安装。它安装在home/ilmu011/Qt/6.2.3/gcc64 64下。但我收到一条错误信息：

CMake Error at CMakeLists.txt:14 (find_package):
  By not providing "FindQt6.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt6", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt6" with any of
  the following names:

    Qt6Config.cmake
    qt6-config.cmake

  Add the installation prefix of "Qt6" to CMAKE_PREFIX_PATH or set "Qt6_DIR"
  to a directory containing one of the above files.  If "Qt6" provides a
  separate development package or SDK, be sure it has been installed.


-- Configuring incomplete, errors occurred!
See also "/home/ilmu011/Desktop/Button/build/CMakeFiles/CMakeOutput.log".
make: *** [Makefile:176: cmake_check_build_system] Error 1

它告诉我将CMAKE_PREFIX_PATH设置为QT6位置，这是我在这里做的，但仍然无法工作。我四处寻找解决方案，发现了这篇文章：

CMAKE_PREFIX_PATH doesn't help CMake in finding Qt5

它说，由于错误消息还指出，最终需要一个单独的开发包来提供CMake抱怨的"qt6-config.cmake“，所以我应该尝试安装以下两件东西：

sudo apt-get install qtbase5 5-dev sudo apt-get install qtstatative5-dev

但是，这些都是针对QT5的，但没有起作用。如何让CMake检测到QT6？

Answer 1

我寻找答案是因为我遇到了一个类似的问题，我的Qt版本是6.3.0而不是6.2.3，cmake版本是3.22.1，Ubuntu22.04。要消除以前的错误，确实需要删除cmake文件夹：

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_INCLUDE_CURRENT_DIR ON)


#this solution was suggested by another stackoverflow user and it worked too
#list(APPEND CMAKE_PREFIX_PATH "/home/username/Qt/6.3.0/gcc_64")

set(CMAKE_PREFIX_PATH "/home/username/Qt/6.3.0/gcc_64")

find_package(Qt6 CONFIG REQUIRED COMPONENTS Core Gui)

Qt6CoreTools_DIR，Qt6Core_DIR，Qt6DBusTools_DIR，Qt6GuiTools_DIR，Qt6Gui_DIR，Qt6_DIR，XKB_INCLUDE_DIR，XKB_LIBRARY也不知道为什么。

这是重复的问题：CMake cannot find packages within Qt6 installation