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(make) Implicit/Search

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 4.5.5 Directory Search and Implicit Rules
 -----------------------------------------
 
 The search through the directories specified in `VPATH' or with `vpath'
 also happens during consideration of implicit rules ( Using
 Implicit Rules Implicit Rules.).
 
    For example, when a file `foo.o' has no explicit rule, `make'
 considers implicit rules, such as the built-in rule to compile `foo.c'
 if that file exists.  If such a file is lacking in the current
 directory, the appropriate directories are searched for it.  If `foo.c'
 exists (or is mentioned in the makefile) in any of the directories, the
 implicit rule for C compilation is applied.
 
    The commands of implicit rules normally use automatic variables as a
 matter of necessity; consequently they will use the file names found by
 directory search with no extra effort.
 
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