add to project files

[flightgear.git] / src / Instrumentation / vertical_speed_indicator.cxx

diff --git a/src/Instrumentation/vertical_speed_indicator.cxx b/src/Instrumentation/vertical_speed_indicator.cxx
index e062db010087e8f3a646a5282c750a99d0999967..1ad62253b61a29ffff7d6aec4b940ef5a6e44ffe 100644 (file)
--- a/src/Instrumentation/vertical_speed_indicator.cxx
+++ b/src/Instrumentation/vertical_speed_indicator.cxx
@@ -9,6 +9,7 @@
 #include <Main/fg_props.hxx>
 #include <Main/util.hxx>
 
+using std::string;
 
 VerticalSpeedIndicator::VerticalSpeedIndicator ( SGPropertyNode *node )
     : _internal_pressure_inhg(29.92),