CMake - Could not find a package configuration file provided by "QT"

I've got some problems with CMake. It shows me an error when I try to configure my build for Visual Studio 2019. Everything looks fine to me when I check the CMakeLists.txt, but something is still wrong. The file was auto created by Qt, I just added some things to connect some directories. What can I do to solve this problem?

Here is the error:

Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19041.
The CXX compiler identification is MSVC 19.28.29334.0
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Check for working CXX compiler: D:/VS/VS-IDE/VC/Tools/MSVC/14.28.29333/bin/Hostx64/x64/cl.exe - skipped
Detecting CXX compile features
Detecting CXX compile features - done
CMake Error at CMakeLists.txt:27 (find_package): Could not find a package configuration file provided by "QT" with any of the following names: Qt6Config.cmake qt6-config.cmake Qt5Config.cmake qt5-config.cmake Add the installation prefix of "QT" to CMAKE_PREFIX_PATH or set "QT_DIR" to a directory containing one of the above files. If "QT" provides a separate development package or SDK, be sure it has been installed.
Configuring incomplete, errors occurred!

Here is my CMakeList.txt:

cmake_minimum_required(VERSION 3.5)
project(bacteria LANGUAGES CXX)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# QtCreator supports the following variables for Android, which are identical to qmake Android variables.
# Check for more information.
# They need to be set before the find_package(Qt5 ...) call.
#if(ANDROID)
# set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
# if (ANDROID_ABI STREQUAL "armeabi-v7a")
# set(ANDROID_EXTRA_LIBS
# ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libcrypto.so
# ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libssl.so)
# endif()
#endif()
find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets LinguistTools REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets LinguistTools REQUIRED)
#Mine add
find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)
set(TS_FILES bacteria_ru_RU.ts)
#Mine add
set(CMAKE_PREFIX_PATH "D:/Qt/5.15.2/mingw81_64")
if(ANDROID) add_library(bacteria SHARED main.cpp mainwindow.cpp mainwindow.h mainwindow.ui #My add mainmatrix.cpp mainmatrix.h microbe.cpp microbe.h microbecontainer.cpp microbecontainer.h food.cpp food.h ${TS_FILES} )
else() add_executable(bacteria main.cpp mainwindow.cpp mainwindow.h mainwindow.ui #My add mainmatrix.cpp mainmatrix.h microbe.cpp microbe.h microbecontainer.cpp microbecontainer.h food.cpp food.h ${TS_FILES} )
endif()
target_link_libraries(bacteria PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
qt5_create_translation(QM_FILES ${CMAKE_SOURCE_DIR} ${TS_FILES})

2 Answers

adding set(CMAKE_PREFIX_PATH "/Users/YOURPATH/Qt/6.1.0/clang_64")this line of code before the find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED) solved the problem for me (macOS).Find the QT directory and copy the path of the /clang_64 file. If you have problems with QT then try to reinstall

In case if you are experiencing the same problem on Mac, here's what I added beforefind_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED):

set(CMAKE_PREFIX_PATH "/Users/MY_USER_NAME/Qt/6.1.2/macos/lib/cmake")

In my case cmake contained a lot of folders, many of which had .cmake files. Apparently CMake found the required packages there.