postgresql installation - PL/???

This should be a dumb question:

--with-perl

I don't see that I have to do this in order to load pl/perl as a
function/trigger language option.  So I should assume that this will
compile pl/perl in rather than having it available as a loadable
function.  Nice for optimizations?

I'm assuming this is the case because there is no option for something
like PL/Ruby support, but Ruby is available as a loadable function.

And should I also be able to assume that PL/PgSQL is compiled into
postgresql?


so I don't really need to use any particular flags, with the probable
exception of --with-ssl?