For real BSDs (FreeBSD, OpenBSD, etc.) the following parts of the code have to be updated:

• The ptrace() code in ptrace.cc needs to be updated to use the BSD ptrace() interface
• The ASLR code in aslr.cc has to be updated
• The setns() stuff should be disabled on BSD, since it's Linux-specific

For macOS, all of the above need to be done, plus Mach-O parsing code needs to be added to symbol.cc.