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diff --git a/lib/builtins/int_lib.h b/lib/builtins/int_lib.h
new file mode 100644
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+++ b/lib/builtins/int_lib.h
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+/* ===-- int_lib.h - configuration header for compiler-rt  -----------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file is a configuration header for compiler-rt.
+ * This file is not part of the interface of this library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#ifndef INT_LIB_H
+#define INT_LIB_H
+
+/* Assumption: Signed integral is 2's complement. */
+/* Assumption: Right shift of signed negative is arithmetic shift. */
+/* Assumption: Endianness is little or big (not mixed). */
+
+/* ABI macro definitions */
+
+#if __ARM_EABI__
+# define ARM_EABI_FNALIAS(aeabi_name, name)         \
+  void __aeabi_##aeabi_name() __attribute__((alias("__" #name)));
+# define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
+#else
+# define ARM_EABI_FNALIAS(aeabi_name, name)
+# define COMPILER_RT_ABI
+#endif
+
+#if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
+/*
+ * Kernel and boot environment can't use normal headers,
+ * so use the equivalent system headers.
+ */
+#  include <machine/limits.h>
+#  include <sys/stdint.h>
+#  include <sys/types.h>
+#else
+/* Include the standard compiler builtin headers we use functionality from. */
+#  include <limits.h>
+#  include <stdint.h>
+#  include <stdbool.h>
+#  include <float.h>
+#endif
+
+/* Include the commonly used internal type definitions. */
+#include "int_types.h"
+
+/* Include internal utility function declarations. */
+#include "int_util.h"
+
+COMPILER_RT_ABI si_int __paritysi2(si_int a);
+COMPILER_RT_ABI si_int __paritydi2(di_int a);
+
+COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
+COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
+COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
+
+COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
+COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
+#ifdef CRT_HAS_128BIT
+COMPILER_RT_ABI si_int __clzti2(ti_int a);
+COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
+#endif
+
+#endif /* INT_LIB_H */