Tilde Rules Superseded

This version of make automatically runs sccs get, as appropriate, when there is no rule to build a target file. A tilde appended to a suffix in the suffixes list indicates that sccs extraction is appropriate for the dependency file. make no longer supports tilde suffix rules that include commands to extract current versions of sccs files.

To inhibit or alter the procedure for automatic extraction of the current sccs version, redefine the .SCCS_GET special-function target. An empty rule for this target entirely inhibits automatic extraction.