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(automake.info)Sources

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Built sources
=============

   Occasionally a file which would otherwise be called `source' (e.g. a
C `.h' file) is actually derived from some other file.  Such files
should be listed in the `BUILT_SOURCES' variable.

   Built sources are also not compiled by default.  You must explicitly
mention them in some other `_SOURCES' variable for this to happen.

   Note that, in some cases, `BUILT_SOURCES' will work in somewhat
surprising ways.  In order to get the built sources to work with
automatic dependency tracking, the `Makefile' must depend on
`$(BUILT_SOURCES)'.  This can cause these sources to be rebuilt at what
might seem like funny times.