Hisu Kang: 
  - Suggestion for IEEE 802.1Q support
  - Preliminary patch for 6in4 support (patch adapted)

William Stearns:
  - Tests for OS X compatibility (10.9 with MacPorts project)

Aapo Rantalainen:
  - Segfault fix on malformed 802.1q header

jurmc:
  - Support for OpenSSL >= 1.1.0
