X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FEnvironment%2Ffgmetar.hxx;h=c75a3c2491984972e8bf7d8b7b6156e8844473dc;hb=386aefe69358ce41a11c9afeb8f56e26758fe56b;hp=7d69684f5ff55b920cbd30fdfb2c8b9864e5550b;hpb=c9813d1b5d79b4aad13c263690a0223086af25ac;p=flightgear.git

diff --git a/src/Environment/fgmetar.hxx b/src/Environment/fgmetar.hxx
index 7d69684f5..c75a3c249 100644
--- a/src/Environment/fgmetar.hxx
+++ b/src/Environment/fgmetar.hxx
@@ -30,12 +30,12 @@
 
 #include <simgear/environment/metar.hxx>
 
-SG_USING_STD(vector);
-SG_USING_STD(map);
-SG_USING_STD(string);
+using std::vector;
+using std::map;
+using std::string;
 
 
-class FGMetar : public SGMetar {
+class FGMetar : public SGMetar, public SGReferenced {
 public:
 	FGMetar(const string& icao, const string& proxy = "", const string& port = "",
 			const string &auth = "");