nvMcJohn/apitest
thirdparty/SDL2-2.0.1/cmake/sdlchecks.cmake
:403
check_c_source_compiles("
#include <X11/Xlibint.h>
extern int _XData32(Display *dpy,register _Xconst long *data,unsigned len);
int main(int argc, char **argv) {}" HAVE_CONST_XDATA32)