In file included from ../uppsrc/Core/App.cpp:1:
In file included from ../uppsrc/Core/Core.h:199:
../uppsrc/Core/Defs.h:253:45: error: use of undeclared identifier 'isnan'; did
      you mean 'std::isnan'?
inline bool IsNaN(double d)        { return isnan(d); }  /*{ return ...
                                            ^~~~~
                                            std::isnan              
/usr/include/c++/4.2.1/cmath:550:5: note: 'std::isnan' declared here
    isnan(_Tp __f) { return ::__gnu_cxx::__capture_isnan(__f); }
    ^
In file included from ../uppsrc/Core/App.cpp:1:
In file included from ../uppsrc/Core/Core.h:226:
../uppsrc/Core/String.h:2:10: fatal error: 'Core.h' file not found
#include <Core.h>