See http://gcc.gnu.org/PR3106

 Backported from gcc-3.0.x

 Fixes error

   .../binutils-2.11.2/libiberty/strerror.c:468: error: conflicting types for `sys_nerr'

   /usr/include/stdio.h:258: error: previous declaration of `sys_nerr'

   make[1]: *** [strerror.o] Error 1

   make: *** [all-libiberty] Error 2

 on Mac OS X.

 --- gcc-2.95.3/libiberty/strerror.c.old	2004-03-24 16:23:19.000000000 -0800

 +++ gcc-2.95.3/libiberty/strerror.c	2004-03-24 16:23:48.000000000 -0800

 @@ -13,6 +13,7 @@

     incompatible with our later declaration, perhaps by using const

     attributes.  So we hide the declaration in errno.h (if any) using a

     macro. */

 +#define sys_nerr sys_nerr__

  #define sys_errlist sys_errlist__

  #endif

 @@ -20,6 +21,7 @@

  #include <errno.h>

  #ifdef HAVE_SYS_ERRLIST

 +#undef sys_nerr

  #undef sys_errlist

  #endif