foo.cpp: In function 'int main()':
foo.cpp:7:1: error: 'OSVERSIONINFO' was not declared in this scope
foo.cpp:7:17: error: expected ';' before 'osver'
foo.cpp:8:1: error: 'osver' was not declared in this scope
foo.cpp:9:20: error: 'GetVersionEx' was not declared in this scope