anchor.diff:  #include <grovel/common.h>
   
   int main(int argc, char**argv) {
  +  int autotype_tmp;
     FILE *output = argc > 1 ? fopen(argv[1], \"w\") : stdout;
     fprintf(output, \";;;; This file has been automatically generated by \"
                     \"iolib-grovel.\\n;;;; Do not edit it by hand.\\n\\n\");
  
positive.code:    #+darwin (list "-I" "/opt/local/include/")
     #-darwin nil
     ;; ECL internal flags
     #+ecl (list c::*cc-flags*)))
  
  ;;; FIXME: is there a better way to detect whether these flags
  ;;; are necessary?
  (defparameter *cpu-word-size-flags*
    #-(or x86 x86-64 sparc sparc64)
    '()
    #+(or x86 x86-64 sparc sparc64)
    (ecase (cffi:foreign-type-size :long)
      (4 (list "-m32"))
      (8 (list "-m64"))))
  
  
negative.code: 
  (defun c-format (out fmt &rest args)
    (let ((text (unescape-for-c (format nil "~?" fmt args))))
      (format out "~&  fputs(\"~A\", output);~%" text)))
  
  (defun c-printf (out fmt &rest args)
    (flet ((item (item)
  