Other open-source projects package libsignal as libsignal-protocol-c: https://repology.org/project/libsignal-protocol-c/versions The Repology project recommends we rename our port (see https://repology.org/project/libsignal/report).
A commit references this bug: Author: sunpoet Date: Tue Mar 30 19:13:30 UTC 2021 New revision: 569581 URL: https://svnweb.freebsd.org/changeset/ports/569581 Log: Move net/libsignal to net/libsignal-protocol-c PR: 254100 Suggested by: 0mp Changes: head/MOVED head/net/Makefile head/net/libsignal/ head/net/libsignal-protocol-c/ head/net/libsignal-protocol-c/Makefile
Committed. Thanks!