bootstrap fails on Tru64

[Dave Love <d dot love at dl dot ac dot uk>]

`make bootstrap' for gcc 3.2 on Tru64 5.1a fails thus, though gcc 3.1
built OK:

  stage1/xgcc -Bstage1/ -B/usr/local/alphaev67-dec-osf5.1/bin/ -DIN_GCC    -g -O2 -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long  -DHAVE_CONFIG_H  -o cc1 \
          c-parse.o c-lang.o attribs.o c-errors.o c-lex.o c-pragma.o c-decl.o c-typeck.o c-convert.o c-aux-info.o c-common.o c-format.o c-semantics.o c-objc-common.o libcpp.a  main.o libbackend.a ./intl/libintl.a  -liconv  ../libiberty/libiberty.a
  libiconv
  libiconv_open
  libiconv_close
  collect2: ld returned 1 exit status
  gmake[2]: *** [cc1] Error 1

If I configure with --disable-nls it gets further, but still fails,
which I guess is a configuration bug:

stage1/xgcc -Bstage1/ -B/usr/local/alphaev67-dec-osf5.1/bin/ -DIN_GCC    -g -O2 -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long  -DHAVE_CONFIG_H  -o jc1 \
        java/parse.o java/class.o java/decl.o java/expr.o java/constants.o java/lang.o java/typeck.o java/except.o java/verify.o java/zextract.o java/jcf-io.o java/jcf-parse.o java/mangle.o java/mangle_name.o java/builtins.o java/jcf-write.o java/buffer.o java/check-init.o java/jcf-depend.o java/jcf-path.o java/xref.o java/boehm.o mkdeps.o main.o libbackend.a -lz -liconv   ../libiberty/libiberty.a
libiconv_open
libiconv
libiconv_close
collect2: ld returned 1 exit status
gmake[2]: *** [jc1] Error 1

I can't immediately see what's going on, i.e. where those symbols with
the `lib' prefix have come from.  Any ideas what to check?  It may be
relevant that the system has libiconv in /usr/local from the
Compaq-packaged Gnome stuff:

$ rpm -qi libiconv   
Name        : libiconv                     Relocations: (not relocateable)
Version     : 1.6                               Vendor: (none)
Release     : 1                             Build Date: Sat Mar 17 04:44:38 2001
Install date: Thu Jan 31 12:03:43 2002      Build Host: redrover.zk3.dec.com
Group       : System Environment/Libraries   Source RPM: libiconv-1.6-1.src.rpm
Size        : 1421513                          License: LGPL
Packager    : Aron Griffis <agriffis@bigfoot.com>
URL         : http://www.gnome.org/
Summary     : iconv() implementation with Unicode support
Description :
This library provides an iconv() implementation, for use on systems
which don't have one, or whose implementation cannot convert from/to
Unicode.