Check if wx is installed twice

It may happen that you installed wx through distro packages and also through self-compilation process.
To check if you have a system with wxWidgets installed twice, run:

ls -l /usr/bin/wx*
ls -l /usr/local/bin/wx*

Only one of the two commands should give results. If none gives results (something like "No such file or directory") then you don't have wx installed at all. If both give some result, then you have wx installed twice. In this latter case, read How to uninstall wxWidgets to remove all wx installations and install wx again.