The "Unknown compiler version" is just one set of many harmless Warnings (which are different from Errors) that result when you have a large codebase that's worked on with several different compilers and operating systems.
GCC wants things to be formatted this way, VC wants things that way, Borland a different way, Solaris its own way. Even different versions of the same compiler may want code to be laid out differently (VS 2003 vs VS 2013), and the codebase has been worked on for a long, long time.
Code interpreting can be different enough that compiler-specific preprocessor directives have to be added so that certain bits of code come up differently in different compilers in order to work properly.
The result of having so many different compilers working on the same project is that every compiler is going to complain about various things that the other compilers require. These are simply Warnings ("Hey. Make sure this is what you want to do. It looks fishy to me.") and do not hamper the compilation.
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