diff --git a/libc/kernel/arch-x86/asm/sembuf.h b/libc/kernel/arch-x86/asm/sembuf.h
new file mode 100644
index 0000000..1695208
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/sembuf.h
@@ -0,0 +1,26 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _ASM_X86_SEMBUF_H
+#define _ASM_X86_SEMBUF_H
+
+struct semid64_ds {
+ struct ipc64_perm sem_perm;
+ __kernel_time_t sem_otime;
+ unsigned long __unused1;
+ __kernel_time_t sem_ctime;
+ unsigned long __unused2;
+ unsigned long sem_nsems;
+ unsigned long __unused3;
+ unsigned long __unused4;
+};
+
+#endif