1.8.7p72 on HP-UX 11.x/IA64 with pthreads

Anyone built 1.8.7p72 on HP-UX 11.23/IA64 or 11.31/IA64 with pthreads
enabled? The following works:
  $ gtar zxf ruby-1.8.7-p72.tar.gz
  $ cd ruby-1.8.7-p72
  $ ./configure

But the following does not:
  $ gtar zxf ruby-1.8.7-p72.tar.gz
  $ cd ruby-1.8.7-p72
  $ ./configure --enable-pthread
  ...
  $ gmake
  ...
  cc -g -DRUBY_EXPORT -DYYMAXDEPTH=300 -I. -I. -c main.c
  cc -g -DRUBY_EXPORT -DYYMAXDEPTH=300 -I. -I. -c dmydln.c
  cc -g -DRUBY_EXPORT -DYYMAXDEPTH=300 -L. -Wl,-E main.o dmydln.o libruby-static.a -lpthread -ldld -ldl -lm -o miniruby
  rbconfig.rb updated
  /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:350:in `conv_arg': stack level too deep (SystemStackError)
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:454:in `parse'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1261:in `parse_in_order'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1249:in `catch'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1249:in `parse_in_order'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1243:in `order!'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1334:in `permute!'
          from /opt/build/china/ruby-1.8.7-p72/lib/optparse.rb:1355:in `parse!'
          from ./ext/extmk.rb:288:in `parse_args'
          from ./ext/extmk.rb:324
  gmake: *** [all] Error 1

···

--
albert chin (china @at@ thewrittenword .dot. com)