Changes since 2.6.2:

• Correct macports-clang c++11+ compiler selection with non-libc++
  installations. (kencu in 3ea1fb4)

• Avoid problems with trace mode on modern macOS.
  (#60702, saagarjha, cal in d96e5a8)

• Added some basic support for Apple Silicon.
  (jeremyhu, jmr in 6eaa8d5, 901eb21, 01afdbb)

• Fixed an issue where post-extract ran with elevated privileges when
  adduser was used in a Portfile. (#50918, cal in ac1a9b0)

• Fixed cases where a proper error message was not displayed when curl
  failed. (#60581, cal in f535c26)

• Reduced the number of processes spawned when pinging mirror sites.
  (ryandesign in cee74bb)

• Support new naming scheme used starting with macports-clang-10 in
  configure.compiler. (jonesc in 5c3f571)

• Fixed dmg and mdmg targets on 10.15+. (#59697, jmr in 0459cb1)

• Ensure archive paths are correctly quoted when extracting.
  (#60365, jmr in 8a088c3)