fix travis

src/core/qgsunittypes.h

@@ -39,6 +39,7 @@ class CORE_EXPORT QgsUnitTypes
     Q_GADGET
 
   public:
+    //! Systems of unit measurement
     enum SystemOfMeasurement
     {
       UnknownSystem = 0, //!< Unknown system of measurement

src/quickgui/qgsquickcoordinatetransformer.cpp

@@ -88,7 +88,7 @@ void QgsQuickCoordinateTransformer::updatePosition()
   // If Z is NaN, coordinate transformation (proj4) will
   // also set X and Y to NaN. But we also want to get projected
   // coords if we do not have any Z coordinate.
-  if ( qIsNaN( z ) )
+  if ( std::isnan( z ) )
   {
     z = 0;
   }