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# INTERFACE_INCLUDE_DIRECTORIES

List of public include directories for a library.

The `target_include_directories()` command populates this property with values given to the `PUBLIC` and `INTERFACE` keywords. Projects may also get and set the property directly.

Targets may populate this property to publish the include directories required to compile against the headers for the target. Consuming targets can add entries to their own `INCLUDE_DIRECTORIES` property such as `$<TARGET_PROPERTY:foo,INTERFACE_INCLUDE_DIRECTORIES>` to use the include directories specified in the interface of `foo`.

Contents of `INTERFACE_INCLUDE_DIRECTORIES` may use “generator expressions” with the syntax `$<...>`. See the `cmake-generator-expressions(7)` manual for available expressions. See the `cmake-buildsystem(7)` manual for more on defining buildsystem properties.

Include directories usage requirements commonly differ between the build-tree and the install-tree. The `BUILD_INTERFACE` and `INSTALL_INTERFACE` generator expressions can be used to describe separate usage requirements based on the usage location. Relative paths are allowed within the `INSTALL_INTERFACE` expression and are interpreted relative to the installation prefix. For example:

    set_property(TARGET mylib APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES
      $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/mylib>
      $<INSTALL_INTERFACE:include/mylib>  # <prefix>/include/mylib
      )

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