* 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/libstore/store-api.cc

@@ -2,10 +2,21 @@
 #include "globals.hh"
 #include "util.hh"
 
+#include <stdint.h>
+
 
 namespace nix {
 
 
+GCOptions::GCOptions()
+{
+    action = gcDeleteDead;
+    ignoreLiveness = false;
+    maxFreed = ULLONG_MAX;
+    maxLinks = 0;
+}
+
+
 bool StoreAPI::hasSubstitutes(const Path & path)
 {
     PathSet paths = querySubstitutablePaths();