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12.18.1 Variables listed in VPATH

Do not set VPATH to the value of another variable, for example ‘VPATH = $(srcdir)’, because some ancient versions of make do not do variable substitutions on the value of VPATH. For example, use this

     srcdir = @srcdir@
     VPATH = @srcdir@

rather than ‘VPATH = $(srcdir)’. Note that with GNU Automake, there is no need to set this yourself.