Compilation fails on Ubuntu 18

[keithbriggs]

I have a standard Ubuntu 18 installation, fulling up-to-date. I get:

inet/environment/ground/OsgEarthGround.cc In file included from inet/environment/ground/OsgEarthGround.cc:25:0: ./inet/visualizer/scene/SceneOsgEarthVisualizer.h:51:18: error: ‘virtual void inet::visualizer::SceneOsgEarthVisualizer::initializeScene()’ marked ‘override’, but does not override virtual void initializeScene() override; ^~~~~~~~~~~~~~~ Makefile:1754: recipe for target '../out/gcc-release/src/inet/environment/ground/OsgEarthGround.o' failed make[1]: *** [../out/gcc-release/src/inet/environment/ground/OsgEarthGround.o] Error 1 make[1]: Leaving directory '/home/kbriggs/Downloads/inet4/src' Makefile:7: recipe for target 'all' failed make: *** [all] Error 2