fix optimized build

src/core/ptr.h

@@ -22,6 +22,7 @@
 #ifndef PTR_H
 #define PTR_H
 
+#include <iostream>
 #include <stdint.h>
 #include "assert.h"
 

src/core/random-variable-default-value.cc

@@ -43,7 +43,8 @@ RandomVariable *
 RandomVariableDefaultValue::GetCopy (void)
 {
   RandomVariable *variable;
-  bool ok = Parse (m_value, true, &variable);
+  bool ok;
+  ok = Parse (m_value, true, &variable);
   NS_ASSERT (ok);
   return variable;
 }