Installing with portmaster fails as follows :
===> Registering installation for llvm-devel-10.0.d20191218
pkg-static: Unable to access file /usr/ports/devel/llvm-devel/work/stage/usr/local/llvm-devel/lib/libarcher.so:No such file or directory
pkg-static: Unable to access file /usr/ports/devel/llvm-devel/work/stage/usr/local/llvm-devel/lib/libarcher_static.a:No such file or directory
*** Error code 74
I have the OPENMP option disabled and libarcher is apparently related to OpenMP. I suppose it spuriously tries to install something that wasn't built.
A commit references this bug:
Date: Fri Dec 20 21:51:46 UTC 2019
New revision: 520528
Correct plist when OPENMP is disabled.
Reported by: email@example.com
Sponsored by: DARPA, AFRL
Thanks for the report! Should be fixed now.