message: Added FreeBSD references to solve install issues
  Added FreeBSD as possible target OS. Python3.6 install --user was throwing error about unknown OS.
  these fixes worked on my end.
diff: @@ -49,6 +49,7 @@ libpylief = {
  'Windows': "_pylief.pyd",
  'Darwin': "_pylief.so",
  'Linux': "_pylief.so",
  + 'FreeBSD': "_pylief.so",
  }
  version_re = r"Version:\s+(?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)\.?(.*)"
  if in_source_package:
  @@ -72,6 +73,9 @@ def get_lief_platform_name():
  return "osx" if arch == 64 else "osx_x32"
  elif system == 'Linux':
  return "linux" if arch == 64 else "linux_x32"
  + elif system == 'FreeBSD':
  + return "freebsd" if arch == 64 else "freebsd_x32"
  +
  class lief_sdist(sdist):
  