diff -u -r bbswitch-0.8/bbswitch.c bbswitch-0.8-5.7/bbswitch.c
--- bbswitch-0.8/bbswitch.c	2020-06-02 00:34:20.370571802 +0000
+++ bbswitch-0.8-5.7/bbswitch.c	2020-06-02 00:35:18.161403639 +0000
@@ -29,6 +29,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/pci.h>
+#include <linux/proc_fs.h>
 #include <linux/acpi.h>
 #include <linux/module.h>
 #include <asm/uaccess.h>