cppbind: automatic conversion of SGReferenced derived pointers.

[simgear.git] / simgear / props / condition.cxx

diff --git a/simgear/props/condition.cxx b/simgear/props/condition.cxx
index bfc1bf618fd0beff674b1071fe9e50dff70331a2..04b892e53558bdc0b9bfa4f7aca07d7b974434b2 100644 (file)
--- a/simgear/props/condition.cxx
+++ b/simgear/props/condition.cxx
@@ -22,6 +22,8 @@
 
 using std::istream;
 using std::ostream;
+using std::string;
+
 /**
  * Condition for a single property.
  *