When included in a makefile, this target enables hidden dependency and command-dependency checking. In addition, make updates the state file .make.state after each run.
The .KEEP_STATE target should not be removed if it has been used in a make run.
These targets can be used to supply commands to perform at the beginning and end of each make run.
The commands supplied are performed when make fails.
These can be used to indicate which targets are to be processed in parallel, and which are to be processed in serial fashion.
This target contains the rule for extracting current versions of files from sccs history files.
When this target appears in the dependency list, make waits until the dependencies that precede it are finished before processing those that follow, even when processing is parallel.