There's something going on: here it currently compiles well, but if I go to the Centaur settings and try to edit the include paths, it tells me that the "..\" are pointing at the wrong place....
Could you go to Centaur project properties > C/C++ > General > Additional Include Directories, and tell us what is there? Here it is "..\..\..\include;..\..\..\libUltra\include", which not only works but makes sense.
If it is the same try to click there and then in edit, and check the checkbox at the bottom and recompile please.