make a port use base llvm

[tech-lists]

Hi,

How can one make a port compile against base llvm? What would I need to do?

% llvm-tblgen --version
LLVM (http://llvm.org/):
   LLVM version 11.0.0
   Optimized build with assertions.
   Default target: aarch64-unknown-freebsd13.0
   Host CPU: (unknown)

I run a poudriere instance on rpi4 hardware. Can I make some ports at least
try to use system llvm? If I can do this, and it fails, should I report the
failure? would it be useful info? Where to report?

what I'm trying to get round is to not use ported llvm if at all possible
because it leads to massive build times.

thanks
-- 
J.
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