diff --git a/sys/compat/linuxkpi/common/include/linux/apple-gmux.h b/sys/compat/linuxkpi/common/include/linux/apple-gmux.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/apple-gmux.h
@@ -0,0 +1,12 @@
+/* Public domain. */
+
+#ifndef _LINUXKPI_LINUX_APPLE_GMUX_H
+#define _LINUXKPI_LINUX_APPLE_GMUX_H
+
+static inline bool
+apple_gmux_detect(void *a, void *b)
+{
+	return false;
+}
+
+#endif