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The PROJECTDIR environment variable is used only by the
sccs driver program. This variable is ignored if the the
sccs program is installed with the set-user-ID bit set. See
8.2 Known Problems, for other remarks concerning setuid execution.
The PROJECTDIR variable is used to locate the SCCS history
file corresponding to a filename given on the command line. If the
value of PROJECTDIR starts with a `/', it is used as an absolute
directory name. If PROJECTDIR does not start with a slash, it is
assumed to be the name of a user, and SCCS files are assumed to be
in the subdirectory "src" or "source" beneath their home directory.