Fix compilation on GCC 3.2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5136 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index 5483f80..98b2fc6 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -8,6 +8,7 @@
 #include "SystemUtils.h"
 #include <algorithm>
 #include <fstream>
+#include <iostream>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>