The following bootstrap error occurs building libiberty:

if [ x"-fPIC" != x ]; then \
  gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc/libiberty/../include  -W -Wall -
Wtraditional -pedantic -fPIC ../../gcc/libiberty/clock.c -o pic/clock.o; \
else true; fi
../../gcc/libiberty/clock.c:71: error: conflicting types for `clock'
/opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.11/3.3/include/sys/time.h:402: error: pr
evious declaration of `clock'

We didn't used to compile clock.o under hpux.  We are knwo trying to build it
because the configure test fails:

configure:4628: checking for clock
configure:4683: gcc -o conftest -g -O2   conftest.c  >&5
configure:4701: error: conflicting types for `clock'
/opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.11/3.3/include/sys/time.h:402: error: 
previous declaration of `clock'
configure:4686: $? = 1
configure: failed program was:
| #line 4638 "configure"
| /* confdefs.h.  */
|
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define WORDS_BIGENDIAN 1
| #define HOST_WORDS_BIG_ENDIAN 1
| #define BYTEORDER 4321
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_SYS_FILE_H 1
| #define HAVE_SYS_PARAM_H 1
| #define HAVE_LIMITS_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_MALLOC_H 1
| #define HAVE_STRING_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_SYS_TIME_H 1
| #define HAVE_TIME_H 1
| #define HAVE_SYS_RESOURCE_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_SYS_MMAN_H 1
| #define HAVE_FCNTL_H 1
| #define HAVE_ALLOCA_H 1
| #define HAVE_SYS_PSTAT_H 1
| #define HAVE_SYS_SYSINFO_H 1
| #define HAVE_SYS_WAIT_H 1
| #define TIME_WITH_SYS_TIME 1
| #define HAVE_UINTPTR_T 1
| #define HAVE_ATEXIT 1
| #define HAVE_BASENAME 1
| #define HAVE_BCMP 1
| #define HAVE_BCOPY 1
| #define HAVE_BSEARCH 1
| #define HAVE_BZERO 1
| #define HAVE_CALLOC 1
| /* end confdefs.h.  */
| /* System header to define __stub macros and hopefully few prototypes,
|     which can conflict with char clock (); below.
|     Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
|     <limits.h> exists even on freestanding compilers.  */
| #ifdef __STDC__
| # include <limits.h>
| #else
| # include <assert.h>
| #endif
| /* Override any gcc2 internal prototype to avoid an error.  */
| #ifdef __cplusplus
| extern "C"
| {
| #endif
| /* We use char because int might match the return type of a gcc2
|    builtin and then its argument prototype would still apply.  */
| char clock ();
| /* The GNU C library defines this for functions which it implements
|     to always fail with ENOSYS.  Some functions are actually named
|     something starting with __ and the normal name is an alias.  */
| #if defined (__stub_clock) || defined (__stub___clock)
| choke me
| #else
| char (*f) () = clock;
| #endif
| #ifdef __cplusplus
| }
| #endif
|
| int
| main ()
| {
| return f != clock;
|   ;
|   return 0;
| }

sys/time.h is included by limits.h when _HPUX_SOURCE is defined.

I believe that this problem was introduced by the following change:

2003-08-27  Daniel Jacobowitz  <drow@mvista.com>

        * aclocal.m4: Include acx.m4 and no-executables.m4.
        (libiberty_AC_FUNC_STRNCMP): Use AC_LIBOBJ.
        (LIB_AC_PROG_CC): Remove.
        * configure.in: Update AC_PREREQ to 2.57.  Use GCC_NO_EXECUTABLES.
        Use AC_PROG_CC and set ac_libiberty_warn_cflags instead of using
        LIB_AC_PROG_CC.  Use AC_LIBOBJ.  Call AC_ISC_POSIX later, only if
        performing link tests.
        * configure: Regenerated.