anchor.diff:      "x86_64-unknown-freebsd"
       "i386-unknown-openbsd"
       "x86_64-unknown-openbsd"
  -    "arm-pc-linux-gnu"))
  +    "arm-pc-linux-gnu"
  +    "arm-unknown-linux-androideabi"))
   
     ;; c2ffi
  
positive.code: 
  (defun local-environment ()
    #+linux "-gnu"
    #-linux "")
  
  (defun local-arch ()
    (string+ (local-cpu) (local-vendor) (local-os) (local-environment)))
  
negative.code:   #+(not (or linux windows darwin)) "-unknown")
  
  (defun local-os ()
    #+(or linux android) "-linux"
    #+windows "-windows-msvc"
    #+darwin "-darwin9"
    #+freebsd "-freebsd"
  