diff --git a/libc/kernel/arch-x86/asm/ldt.h b/libc/kernel/arch-x86/asm/ldt.h
new file mode 100644
index 0000000..19b91ab
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/ldt.h
@@ -0,0 +1,41 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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_LDT_H
+#define _ASM_X86_LDT_H
+
+#define LDT_ENTRIES 8192
+
+#define LDT_ENTRY_SIZE 8
+
+#ifndef __ASSEMBLY__
+
+struct user_desc {
+ unsigned int entry_number;
+ unsigned int base_addr;
+ unsigned int limit;
+ unsigned int seg_32bit:1;
+ unsigned int contents:2;
+ unsigned int read_exec_only:1;
+ unsigned int limit_in_pages:1;
+ unsigned int seg_not_present:1;
+ unsigned int useable:1;
+#ifdef __x86_64__
+ unsigned int lm:1;
+#endif
+};
+
+#define MODIFY_LDT_CONTENTS_DATA 0
+#define MODIFY_LDT_CONTENTS_STACK 1
+#define MODIFY_LDT_CONTENTS_CODE 2
+
+#endif
+#endif