AttachConsole has not been declared
Insert
#ifndef WINVER #define WINVER 0x0603#endif#ifndef _WIN32_WINNT #define _WIN32_WINNT 0x0603#endif#ifndef _WIN32_IE #define _WIN32_IE 0x0700#endif
before
#include <_mingw.h>
in include/wx/msw/gccpriv.h
. (This applies some of this GitHub pull request to wxWidgets 3.1.0 as distributed. The next wxWidgets release, whether 3.1.1 or 3.2.0, should resolve this issue.)