* Make sure that config.h is included before the system headers,

because it defines _FILE_OFFSET_BITS.  Without this, on 
  OpenSolaris the system headers define it to be 32, and then 
  the 32-bit stat() ends up being called with a 64-bit "struct 
  stat", or vice versa.

  This also ensures that we get 64-bit file sizes everywhere.

* Remove the redundant call to stat() in parseExprFromFile().
  The file cannot be a symlink because that's the exit condition
  of the loop before.

src/nix-instantiate/nix-instantiate.cc

@@ -1,6 +1,3 @@
-#include <map>
-#include <iostream>
-
 #include "globals.hh"
 #include "shared.hh"
 #include "eval.hh"
@@ -13,6 +10,9 @@
 #include "common-opts.hh"
 #include "help.txt.hh"
 
+#include <map>
+#include <iostream>
+
 
 using namespace nix;