Moreover, you may perform the build into a dedicated temporary directory (it's cleaner, because when done, you can remove that temporary directory and you get back a clean pristine source tree). The specified command is cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_PREFIX_PATH=`python -c 'import torch;print (torch.utils.cmake_prefix_path)'` -GNinja .. By setting an explicit CMAKE_PREFIX_PATH for a library, it is possible to override the system libraries. An example being /usr/local for UNIX based platforms. Do not forget to set the CMAKE_PREFIX_PATH variable if Eigen is not installed in a default location or if you want to pick a specific version. - Guillaume Racicot Unlike Autotools, CMake can generate build scripts for builders other than Make: Ninja, Visual Studio, etc. Here, path-to-example-directory is the path to the directory that contains both CMakeLists.txt and example.cpp. CMake4. CMake. CMAKE_PREFIX_PATH Semicolon-separated list of directories specifying installation prefixes to be searched by the find_package () , find_program (), find_library (), find_file (), and find_path () commands. if you use the CMake graphical interface, add a new entry CGAL_DIR, or type PATH, and set it to C:\dev\CGAL-5.3, if you use the CMake command line, add -DCGAL_DIR=C:\dev\CGAL-5.3 to the command options. Set your CMAKE_PREFIX_PATH environment variable to the Qt 5 installation prefix. The system directories that are contained in CMAKE_SYSTEM_PREFIX_PATH are locations that typically include installed software. For instance: $ cmake path-to-example-directory -DCMAKE_PREFIX_PATH=$HOME/mypackages I try to run project that is example of cmake usage for pytorch cuda extension link below [1]. Go to Integrations/CMake if you want to learn how to integrate your project or recipes with CMake. CMAKE_MODULE_PATH is for CMake modules, CMAKE_PREFIX_PATH is for installed packages to be found by find_package, for example. In addition to standard platform locations, CMake will also add values to CMAKE_SYSTEM_PREFIX_PATH based on environment variables. This is the recommended way. Please post the command line you are using to set CMAKE_PREFIX_PATH and show the find_package () calls you are using to find Qt. Designed by Kitware, CMake is the most popular build system for new C, C++, and Fortran projects, and many older projects are switching to it as well. Each command will add appropriate subdirectories (like bin, lib, or include) as specified in its own documentation. Note In the following example, non-standard libraries are assumed to be in the folder deps/thirdParty. Probably it will be easiest to diagnose this for Linux or MacOS, so please show for one of those two platforms. For a consistent developer experience on all platforms, use the Ninja or Ninja Multi-Config generator. One of the ways to do this is by setting the CMAKE_PREFIX_PATH variable. 1CMakehello_world23 . In CMake options, add the following line: -DCMAKE_TOOLCHAIN_FILE= [vcpkg root]/scripts/buildsystems/vcpkg.cmake You must add this line to each profile separately. The system directories that are contained in CMAKE_SYSTEM_PREFIX_PATH are locations that typically include installed software. In the example above, the zlib/1.2.11@conan/stable package is not packaging a custom FindZLIB.cmake file, but the FindZLIB.cmake included in the CMake installation directory (/Modules) will locate the zlib library from the Conan package because of the CMAKE_PREFIX_PATH used by the FIND_LIBRARY().. There are different ways you can tell CMake about Qt, but the most common and recommended approach is to set the CMake cache variable CMAKE_PREFIX_PATH to include the Qt 6 installation prefix. If you played with the prefix path or use toolchain file, it could be empty. You can either pass it via -D in the CMake settings dialog or via the set command before find_package. Set the Qt5_DIR in the CMake cache to the location of the Qt5Config.cmake file. It generates a file named conan_paths.cmake and declares these variables: Variables in conan_paths.cmake Make sure you reproduce that in an otherwise empty CMake file. CMAKE_PREFIX_PATH works as a build directive, rather than as an environment variable. cmake_paths This is the reference page for cmake_paths generator. The environment variables and . Example (system libraries not set): Windows Linux An example being /usr/local for UNIX based platforms. Use this, when an exact library version, or a customized library shall be used. For more details, see CMake AUTOMOC . By default this is empty. Like Autotools, CMake is a widely-used build-script generator. When I try to run it using this command it gives If you use a toolchain file, I would advice not setting it back. A file containing only cmake_minimum_required (3.14 REQUIRED) project (test123) message ("$ {CMAKE_PREFIX_PATH}"). Note that Qt Creator will handle this transparently for you. ; The CMAKE_AUTOMOC setting runs moc automatically when required. example-app.cpp We can now run the following commands to build the application from within the example-app/folder: mkdir build cdbuild cmake -DCMAKE_PREFIX_PATH=/absolute/path/to/libtorch .. cmake --build . The prefixes (directories) listed in it will be searched before the default search directories, and lib/, include/ and bin/ will be appended appropriately. In addition to standard platform locations, CMake will also add values to CMAKE_SYSTEM_PREFIX_PATH based on environment variables. For example on Windows, CMake generates Visual Studio project files if a Visual Studio environment is detected. Also show the exact output that demonstrates that Qt is not being found. path to the unzipped LibTorch By setting the environment variable CMAKE_PREFIX_PATH, which is a list of directories (similar to PATH). For example, in the case of MinGW on Windows: If the zlib/1.2.11@conan/stable would had included a custom FindZLIB.cmake in the package root . --config Release where /absolute/path/to/libtorchshould be the absolute (!) CMake C++ /. Open the Toolchains settings ( File > Settings on Windows and Linux, CLion > Preferences on macOS), and go to the CMake settings ( Build, Execution, Deployment > CMake ). CMake's default generator depends on the platform and build environment. So, this is what I do to get cmake find all my KDE4 stuff: $ export CMAKE_PREFIX_PATH . qt_standard_project_setup() For find_package to be successful, CMake must find the Qt installation in one of the following ways:. 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