CMAKE_PREFIX_PATH doesn't help CMake in finding Qt5
I installed the following missing packages:
sudo apt-get install qtbase5-dev
sudo apt-get install qtdeclarative5-dev
Attaching any kind of prefix is not required now:
CMakeList:
:~/junk/qtquick_hello_cmake$ cat CMakeLists.txt
cmake_minimum_required(VERSION 2.8.12)
project(qtquick_hello_cmake)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
find_package(Qt5 COMPONENTS Quick Core REQUIRED)
qt5_add_resources(RESOURCES qml.qrc)
add_executable(${PROJECT_NAME} "main.cpp" "qml.qrc")
qt5_use_modules(${PROJECT_NAME} Quick Core)
target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Quick)
New output:
:~/junk/qtquick_hello_cmake$ ls
build CMakeLists.txt main.cpp main.qml qml.qrc
:~/junk/qtquick_hello_cmake$ cd build/
:~/junk/qtquick_hello_cmake/build$ rm -rf *
:~/junk/qtquick_hello_cmake/build$ cmake ../
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/.../junk/qtquick_hello_cmake/build
Errors are gone now.
Thanks to:
https://answers.ros.org/question/236324/could-not-find-a-package-configuration-file-provided-by-qt5widgets/
https://askubuntu.com/questions/508503/whats-the-development-package-for-qt5-in-14-04
For macOS export the following variable in the terminal.
export CMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.15.1/
There may be another version, check which one you have and change the last path component accordingly.
Issue the build reconfiguration
cmake ../
CMake error message about failed find_package
and setting CMAKE_PREFIX_PATH variable
Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH
is somehow misleading. It talks only about "installation prefix", but this installation still require to contain Qt5Config.cmake
or qt5-config.cmake
files inside for being discoverable by find_package
.
But the message
If "Qt5" provides a separate development package or SDK, be sure it has been installed.
is clear:
One need to install a development package which contains required config files.
Everything above is applicable only to CONFIG mode of find_package
, when "Find" script is provided neither by CMake nor by CMake project which uses this command.