The port invokes the linker directly (not via the compiler driver).
lld does not include any default search paths (unlike the GNU BFD
linker) so cannot find libraries specified as e.g. -lm or -lz.
This can be addressed by invoking the linker via the compiler driver,
or by specifying the search path explicitly with -L. For now just avoid
using lld to link the port.
PR: 214864
Approved by: portmgr (LLD_UNSAFE blanket)
Sponsored by: The FreeBSD Foundation
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