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+add_subdirectory
+----------------
+
+Add a subdirectory to the build.
+
+::
+
+  add_subdirectory(source_dir [binary_dir]
+                   [EXCLUDE_FROM_ALL])
+
+Add a subdirectory to the build.  The source_dir specifies the
+directory in which the source CMakeLists.txt and code files are
+located.  If it is a relative path it will be evaluated with respect
+to the current directory (the typical usage), but it may also be an
+absolute path.  The binary_dir specifies the directory in which to
+place the output files.  If it is a relative path it will be evaluated
+with respect to the current output directory, but it may also be an
+absolute path.  If binary_dir is not specified, the value of
+source_dir, before expanding any relative path, will be used (the
+typical usage).  The CMakeLists.txt file in the specified source
+directory will be processed immediately by CMake before processing in
+the current input file continues beyond this command.
+
+If the EXCLUDE_FROM_ALL argument is provided then targets in the
+subdirectory will not be included in the ALL target of the parent
+directory by default, and will be excluded from IDE project files.
+Users must explicitly build targets in the subdirectory.  This is
+meant for use when the subdirectory contains a separate part of the
+project that is useful but not necessary, such as a set of examples.
+Typically the subdirectory should contain its own project() command
+invocation so that a full build system will be generated in the
+subdirectory (such as a VS IDE solution file).  Note that inter-target
+dependencies supercede this exclusion.  If a target built by the
+parent project depends on a target in the subdirectory, the dependee
+target will be included in the parent project build system to satisfy
+the dependency.