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+include_directories
+-------------------
+
+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 directory property
+INCLUDE_DIRECTORIES for the current CMakeLists file.  They are also
+added to the target property INCLUDE_DIRECTORIES for each target in
+the current CMakeLists file.  The target property values are the ones
+used by the generators.
+
+By default the directories are appended onto the current list of
+directories.  This default behavior can be changed by setting
+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).