how to set up the vpath/VPATH entries for link lib search

[Robert P. J. Day]

  section 4.5.6 of the online gnu make manual is a little ambiguous
about how to define the vpath or VPATH entries to support directory
search for link libraries.  from that section:

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"When a prerequisite's name has the form `-lname', make handles it
specially by searching for the file `libname.so' in the current
directory, in directories specified by matching vpath search paths and
the VPATH search path, and then in the directories `/lib', `/usr/lib',
and `prefix/lib' (normally `/usr/local/lib', but MS-DOS/MS-Windows
versions of make behave as if prefix is defined to be the root of the
DJGPP installation tree).

If that file is not found, then the file `libname.a' is searched for,
in the same directories as above."
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  ok, so what's the standard way you would set vpath?

  vpath %.so dir1:dir2:dir3             ??
  vpath lib.%so dir1:dir2:dir3          ??

rday