* Garbage collector: option `--max-freed' to stop after at least N

bytes have been freed, `--max-links' to stop when the Nix store
  directory has fewer than N hard links (the latter being important
  for very large Nix stores on filesystems with a 32000 subdirectories
  limit).

src/libmain/shared.hh

@@ -26,6 +26,9 @@ namespace nix {
 Path makeRootName(const Path & gcRoot, int & counter);
 void printGCWarning();
 
+unsigned int getIntArg(const string & opt,
+    Strings::iterator & i, const Strings::iterator & end);
+
 /* Whether we're running setuid. */
 extern bool setuidMode;