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`VPATH': Search Path for All Prerequisites
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   The value of the `make' variable `VPATH' specifies a list of
directories that `make' should search.  Most often, the directories are
expected to contain prerequisite files that are not in the current
directory; however, `VPATH' specifies a search list that `make' applies
for all files, including files which are targets of rules.

   Thus, if a file that is listed as a target or prerequisite does not
exist in the current directory, `make' searches the directories listed
in `VPATH' for a file with that name.  If a file is found in one of
them, that file may become the prerequisite (see below).  Rules may then
specify the names of files in the prerequisite list as if they all
existed in the current directory.  Note: Writing Shell Commands with
Directory Search.

   In the `VPATH' variable, directory names are separated by colons or
blanks.  The order in which directories are listed is the order followed
by `make' in its search.  (On MS-DOS and MS-Windows, semi-colons are
used as separators of directory names in `VPATH', since the colon can
be used in the pathname itself, after the drive letter.)

   For example,

     VPATH = src:../headers

specifies a path containing two directories, `src' and `../headers',
which `make' searches in that order.

   With this value of `VPATH', the following rule,

     foo.o : foo.c

is interpreted as if it were written like this:

     foo.o : src/foo.c

assuming the file `foo.c' does not exist in the current directory but
is found in the directory `src'.