I just installed wxWidgets on Ubuntu 18.04 for C++ using the instructions from the following URL: https://www.binarytides.com/install-wxwidgets-ubuntu/
The installation was successful, but instead of calling the header file as #include <wx/wx.h> I have to call for it as #include <wx-3.1/wx/wx.h> which is leading to issues inside additional header files that also call for <wx/wx.h>
Is there any way I can remove the 'wx-3.1' without reinstalling or will I have to go in the header files and add this prefix each time this is called?
The headers are installed correctly, you're just not using the correct path to include them. You must use wx-config to get the flags for compiling and linking your programs, e.g. your compile command should look like
g++ -c `wx-config --cxxflags` foo.cpp
and your link command should look like
g++ -o foo foo.o `wx-config --libs`
If you do it like this, everything should work just as you expect.
P.S. This has nothing to do with your question, but I wish I knew why people decide following instructions on some random 4.5 year old blog post instead of the official build instructions in the manual (or docs/gtk/install.md for Real Programmers who don't read the manuals). This post at least looks correct (after a brief look), but this is not always the case.