anchor.diff:    (:use #:cl)
     ;; compilers.lisp
     (:export
  +   #:*default-compiler*
      #:c-compiler
      #:executable
  +   
  +   #:ensure-compiler
      #:invoke
  -   #:*default-compiler*
      #:c-preprocess
      #:c-assemble
      #:c-link
      #:c-compile
      #:clang
  -   #:gcc
  -   #:ensure-compiler)
  +   #:gcc)
     ;; components.lisp
     (:export
  -   #:flag-component
  -   #:component-direct-flags
  -   #:component-effective-flags
  +   #:option-component
  +   #:component-direct-options
  +   #:component-effective-options
      
      #:multi-type-source-file
      #:file-types
  
positive.code:    #:externalize
     #:shellify
     #:with-cleaned-files
     #:merge-flags
     #:component-path
     #:minimal-shell-namestring
     #:version<))
  
negative.code:    #:c-system
     #:default-header-class
     #:c-system-compiler
     #:c-system-shared-library
     
     #:c++-system
     
     #:*default-header-class*
     
     #:preprocess-system
  