--- lib/rubygems/platform.rb.orig	2016-06-11 14:52:28.468697000 +0200
+++ lib/rubygems/platform.rb	2016-06-11 14:53:11.130833000 +0200
@@ -71,6 +71,7 @@
                       when /darwin(\d+)?/ then          [ 'darwin',    $1  ]
                       when /^macruby$/ then             [ 'macruby',   nil ]
                       when /freebsd(\d+)?/ then         [ 'freebsd',   $1  ]
+                      when /bsdsunix(\d+)?/ then        [ 'bsdsunix',  $1  ]
                       when /hpux(\d+)?/ then            [ 'hpux',      $1  ]
                       when /^java$/, /^jruby$/ then     [ 'java',      nil ]
                       when /^java([\d.]*)/ then         [ 'java',      $1  ]