anchor.diff:  
   (defun local-environment ()
     #+linux "-gnu"
  -  #+android "-androideabi"
  +  #+(and arm android) "-androideabi"
  +  #+(and (not arm) android) "-android"
     #+(not (or linux android)) "")
   
   (defun local-arch ()
  
positive.code:     "i386-unknown-openbsd"
      "x86_64-unknown-openbsd"
      "arm-pc-linux-gnu"
      "arm-unknown-linux-androideabi"))
  
   ;; c2ffi
  
negative.code:   #+x86-64 "x86_64"
    #+(and (not (or x86-64 freebsd)) x86) "i686"
    #+(and (not x86-64) x86 freebsd) "i386"
    #+arm "arm"
    #+arm64 "aarch64")
  
  (defun local-vendor ()
    #+(or linux windows) "-pc"
  