how to cross-build a single application ?

[Glen Barber]

On Thu, Mar 01, 2012 at 06:38:19PM +0100, Luigi Rizzo wrote:
> What is the way to properly cross-build a single program
> (after having gone throught the 'toolchain' and possibly
> even a full 'buildworld') 
> from the top-level directory of a FreeBSD source tree ?
> 
> right now i do something like
> 
> 	cd $SOURCE_ROOT
> 	make MAKEOBJDIRPREFIX=/my_obj_tree TARGET=amd64 buildworld
> 
> but i seem to remember that there is a more efficient way
> when you want to rebuild only one program or one subtree.
> I think i have seen this question being answered from time to time
> but i can't find how now.
> 
> any hints ?
> 

There is this link from the wiki, which shows how to build/install/run
emulators/wine on amd64:

  http://wiki.freebsd.org/Wine#Wine_on_FreeBSD.2BAC8-amd64

If there's an even more efficient way to do it, I'd love if it were
documented somewhere.

Glen