RCS
Any file n is extracted if necessary from an RCS file named either n,v or RCS/n,v. The precise recipe used is ‘$(CO) $(COFLAGS)’. n will not be extracted from RCS if it already exists, even if the RCS file is newer. The rules for RCS are terminal (see Match-Anything Pattern Rules), so RCS files cannot be generated from another source; they must actually exist.
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