do I need to specify explicity what to install for make install to work?

[Anton Shterenlikht]

I was updating my port until I got to

make: don't know how to make install. Stop
*** [do-install] Error code 2

and I realised that I don't really understand
the sequence of commands involved in "make install".
I've looked through the porter's handbook,
but still not clear.

I see lots of post-install targets in
Makefiles, but never just "install".
I presume it should be pulled into by
.include <bsd.port.mk>

Still, if I have a set of source files,
generated object files, and just one
executable I want to install, I probably
have to specify somewhere in the Makefile
the name of this executable, right?

Or are PLIST_FILES and PLIST_DIRS used
to let make know what to install?

Thanks

Anton