JFTR: this bug has been fixed in the Automake-NG fork of Automake
(which assumes GNU make is used to execute its generated makefiles);
see commits v1.11-1838-gdc04691 "[ng] yacc, lex: fix subdir VPATH
builds" and v1.11-1839-ge5b964c "[ng] yacc, lex, compiling: better
use of '$<' (simplify and fix bug)" in the 'ng/master' branch of
the official automake repository.

See also:

 <http://lists.gnu.org/archive/html/automake-ng/2012-02/msg00003.html>
 <http://lists.gnu.org/archive/html/automake-ng/2012-02/msg00011.html>

More information about Automake-NG, from its first git commit:

  <http://lists.gnu.org/archive/html/automake-ng/2011-12/msg00000.html>

Regards,
  Stefano



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