* Start of the setuid helper (the program that performs the operations

that have to be done as root: running builders under different uids,
  changing ownership of build results, and deleting paths in the store
  with the wrong ownership).

src/nix-setuid-helper/main.cc

@@ -0,0 +1,3 @@
+int main(int argc, char * * argv)
+{
+}