anchor.diff: -{ stdenv, fetchurl, automake, autoconf, libtool, flex, bison, texinfo
  +{ stdenv, fetchurl, automake, autoconf, libtool, flex, bison, texinfo, fetchpatch
   
   # Optional Dependencies
   , ncurses ? null
  
positive.code: 
    hardeningDisable = [ "format" ];
  
    preConfigure = ''
      ./autogen.sh
    '';
  
negative.code:   };
  
    postPatch = ''
      substituteInPlace src/prog/gpm-root.y --replace __sigemptyset sigemptyset
    '';
  
  