Fix build again.

diff --git a/src/lib/cross.cc b/src/lib/cross.cc
index b654be6df6e50ef9b1a1fd78edb82d332152c693..7fbba86f9a46195f59857d7d42ac47d83493eb08 100644 (file)
--- a/src/lib/cross.cc
+++ b/src/lib/cross.cc
@@ -31,6 +31,7 @@
 #endif
 
 using std::pair;
+using std::ifstream;
 using std::string;
 
 void