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Add include directories to the build.


include_directories([AFTER|BEFORE] [SYSTEM] dir1 [dir2 …])

Add the given directories to those the compiler uses to search for include files. Relative paths are interpreted as relative to the current source directory.

The include directories are added to the :prop_dir:INCLUDE_DIRECTORIES directory property for the current CMakeLists file. They are also added to the :prop_tgt:INCLUDE_DIRECTORIES target property for each target in the current CMakeLists file. The target property values are the ones used by the generators.

By default the directories specified are appended onto the current list of directories. This default behavior can be changed by setting :variable:CMAKE_INCLUDE_DIRECTORIES_BEFORE to ON. By using AFTER or BEFORE explicitly, you can select between appending and prepending, independent of the default.

If the SYSTEM option is given, the compiler will be told the directories are meant as system include directories on some platforms. Signalling this setting might achieve effects such as the compiler skipping warnings, or these fixed-install system files not being considered in dependency calculations - see compiler docs.

Arguments to include_directories may use “generator expressions” with the syntax “$<…>”. See the :manual:cmake-generator-expressions(7) manual for available expressions. See the :manual:cmake-buildsystem(7) manual for more on defining buildsystem properties.