you are developing
   in Leptonica and need to regenerate the prototypes in allheaders.h:

     (1) xtractprotos is part of Leptonica.  You can 'make' it in either
         src or prog (see the makefile).
     (2) You can output the prototypes for any C file to stdout by running:
             xtractprotos <cfile>     or
             xtractprotos -prestring=[string] <cfile>
     (3) The source for xtractprotos has been packaged up into a tar
         containing just the Leptonica files necessary for building