+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#ifndef DRM_MAX_MINOR
+#define DRM_MAX_MINOR 16
+#endif
+
+#if defined(__linux__)
+
+#define DRM_IOCTL_NR(n) _IOC_NR(n)
+#define DRM_IOC_VOID _IOC_NONE
+#define DRM_IOC_READ _IOC_READ
+#define DRM_IOC_WRITE _IOC_WRITE
+#define DRM_IOC_READWRITE _IOC_READ|_IOC_WRITE
+#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
+
+#else /* One of the *BSDs */
+
+#include <sys/ioccom.h>
+#define DRM_IOCTL_NR(n) ((n) & 0xff)
+#define DRM_IOC_VOID IOC_VOID
+#define DRM_IOC_READ IOC_OUT
+#define DRM_IOC_WRITE IOC_IN
+#define DRM_IOC_READWRITE IOC_INOUT
+#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
+
+#endif
+