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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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