As like as HEAD(14.0-RELEASE) llvm16 was merged in base for 13.2-STABLE
with the OSVERSION 1302507.
- Utilize USE_CXXSTD=c++14 or similar solution where applicable
- Update conditionals to addtionally check for OSVERSION greater than
1302507 and less than 1400000
Approved by: portmgr (blanket)
Sponsored by: The FreeBSD Foundation