automake.info: Include

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Include

   Automake supports an `include' directive which can be used to
include other `Makefile' fragments when `automake' is run.  Note that
these fragments are read and interpreted by `automake', not by `make'.
As with conditionals, `make' has no idea that `include' is in use.
   There are two forms of `include':
`include $(srcdir)/file'
     Include a fragment which is found relative to the current source
     directory.
`include $(top_srcdir)/file'
     Include a fragment which is found relative to the top source
     directory.
   Note that if a fragment is included inside a conditional, then the
condition applies to the entire contents of that fragment.
   Makefile fragments included this way are always distributed because
there are needed to rebuild `Makefile.in'.