• Updated compiler selection for macOS 10.12 Sierra
  (jeremyhu in r141134 and r150305)
• Do not use default archive_sites for custom ports trees
  (raimue in r147456)
• Prune symlinks to deleted libtool archives (.la)
  (#40935, jmr in r119571, r119594, r119595)
• Return an error if livecheck matched a version older than the current
  version.
  (jmr, raimue in r127797, r149299)
• Permit pkg phase to be run as root, if needed for additional
  modifications in destroot.
  (ctreleaven in r152115)
• Ignore warnings on stderr for archive extraction to allow use of gnutar.
  (#42492, cal in r132312)
• Create the documented porthier(7) directory structure in ${prefix}/var
  and ${prefix}/share for destroot phase.
  (#45434, #47688, ryandesign in r135998, r135999)
• When syncing a ports tree failed, operation could continue with the
  wrong uid.
  (#43202, cal in r118570)
• Change default of livecheck.ignore_sslcert to "no".
  (#52515, raimue in r153648)
• No longer check Subversion properties in 'port lint'
  (#48577, ryandesign in r153865)
• Fix problems with the postflight script in the installer.
  (#43875, #43749, cal in r122042, r122044, r154073, r154110)
• Warn when the obsolete Subversion repository is used.
  (raimue in r154451)
• port lint: warn if obsolete $Id$ keyword is used.
  (#52757, raimue in fc45aaf)
• Support multi-valued entries in the maintainers field and allow GitHub
  usernames as maintainers
  (cal in 30c27d5)