I'm starting to run out of ideas on what the issue could be.
- Could you send me your TGUI/include/TGUI/Config.hpp file?
- In CodeBlocks in the menu under Settings > Compiler... in the "Toolchain executables" tab (in the tabs near the top of the Compiler settings window), what is the "Compiler's installation directory" set to?
- If you open a command prompt, what is the output of executing "echo %PATH%"?