CHECK_C_SOURCE_COMPILES("
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
 #define BUILD_ASSERT_OR_ZERO(cond) (sizeof(char [1 - 2*!(cond)]) - 1)
 int main(int argc,const char *argv[]) { return BUILD_ASSERT_OR_ZERO(sizeof(off_t) >= 8); }"
    HAVE_LARGE_FILES2)