diff --git a/include/elf/ChangeLog b/include/elf/ChangeLog
index 485a78e32..af4947c7e 100644
--- a/include/elf/ChangeLog
+++ b/include/elf/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-11  Nick Clifton  <nickc@redhat.com>
+
+	PR 1150
+	* mips.h (STO_OPTIONAL): Define.
+	(ELF_MIPS_IS_OPTIONAL): Define.
+
 2005-09-30  Catherine Moore  <clm@cm00re.com>
 
 	* bfin.h: New file.
diff --git a/include/elf/mips.h b/include/elf/mips.h
index 540815bfe..6afc12ffe 100644
--- a/include/elf/mips.h
+++ b/include/elf/mips.h
@@ -718,6 +718,13 @@ extern void bfd_mips_elf32_swap_reginfo_out
 
 /* This value is used for a mips16 .text symbol.  */
 #define STO_MIPS16		0xf0
+
+/* This bit is used on Irix to indicate a symbol whose definition
+   is optional - if, at final link time, it cannot be found, no
+   error message should be produced.  */
+#define STO_OPTIONAL		(1 << 2)
+/* A macro to examine the STO_OPTIONAL bit.  */
+#define ELF_MIPS_IS_OPTIONAL(other)	((other) & STO_OPTIONAL)
 
 /* The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
    relocation entry specifies up to three actual relocations, all at