Build problem on HP-UX 9.05 with gcc

Has anyone built .20 successfully on HP-UX 9.05?
My make bombs out as follows.

#make
for subdir in h config sbr zotnet mts uip support man; do \
  (cd $subdir && make CC='gcc' CPPFLAGS='' DEFS='-DHAVE_CONFIG_H'
CFLAGS='-O2' LDFLAGS='-s' LIBS='-lndbm ' prefix='/usr/local'
exec_prefix='/usr/local' bindir='/usr/local/bin' etcdir='/usr/local/etc'
libdir='/usr/local/lib' mandir='/usr/local/man' mailspool='/usr/mail'
sendmailpath='/usr/lib/sendmail' default_editor='/usr/bin/vi'
default_pager='/usr/bin/more' all) || exit 1; \
done
make: *** empty variable name.  Stop.
make: *** [all-recursive] Error 1

I couldn't find anything similiar on DejaNews.

                                        Thanks for your time

                                                Dan Harty
                                                Houston, TX