I know how to place custom rules into Makefile.am. I'm doing so for
some BUILT_SOURCES. What I'm wondering now is, how would I add a rule
for the output? Could I add a rule for a single component object file,
which is later linked into the library? Which would be simplest? How
do figure out what the name of the target is that the autotools system
makes? They seem quite long and I don't want to hard-code a name that
will not exist on all systems. Is there some type of "Post Build"
primary that I should use instead of trying a custom rule?