diff --git a/libc/kernel/uapi/linux/isdnif.h b/libc/kernel/uapi/linux/isdnif.h
new file mode 100644
index 0000000..2e9f13c
--- /dev/null
+++ b/libc/kernel/uapi/linux/isdnif.h
@@ -0,0 +1,53 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI__ISDNIF_H__
+#define _UAPI__ISDNIF_H__
+#define ISDN_PTYPE_UNKNOWN 0
+#define ISDN_PTYPE_1TR6 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PTYPE_EURO 2
+#define ISDN_PTYPE_LEASED 3
+#define ISDN_PTYPE_NI1 4
+#define ISDN_PTYPE_MAX 7
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PROTO_L2_X75I 0
+#define ISDN_PROTO_L2_X75UI 1
+#define ISDN_PROTO_L2_X75BUI 2
+#define ISDN_PROTO_L2_HDLC 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PROTO_L2_TRANS 4
+#define ISDN_PROTO_L2_X25DTE 5
+#define ISDN_PROTO_L2_X25DCE 6
+#define ISDN_PROTO_L2_V11096 7
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PROTO_L2_V11019 8
+#define ISDN_PROTO_L2_V11038 9
+#define ISDN_PROTO_L2_MODEM 10
+#define ISDN_PROTO_L2_FAX 11
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PROTO_L2_HDLC_56K 12
+#define ISDN_PROTO_L2_MAX 15
+#define ISDN_PROTO_L3_TRANS 0
+#define ISDN_PROTO_L3_TRANSDSP 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_PROTO_L3_FCLASS2 2
+#define ISDN_PROTO_L3_FCLASS1 3
+#define ISDN_PROTO_L3_MAX 7
+#endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */