make: Directory Search

 
 4.5 Searching Directories for Prerequisites
 ===========================================
 
 For large systems, it is often desirable to put sources in a separate
 directory from the binaries.  The "directory search" features of 'make'
 facilitate this by searching several directories automatically to find a
 prerequisite.  When you redistribute the files among directories, you do
 not need to change the individual rules, just the search paths.
 

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