View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/stdio_sync_filebuf.h:35:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/extc++.h:55,
                 from 0_0_30804024_10510.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/unistd.h:10:16: fatal error: io.h: No such file or directory
 #include <io.h>
                ^
compilation terminated.