build problem trying to find bison

[John Pfuntner]

I'm trying to build gcc on hppa2.0n-hp-hpux11.00.  I downloaded and
unwound, gcc-2_95_1_tar.gz, did the configure step, and ran "make
bootstrap".  It compiled several things and then I got:

            rm -f cpp
            ln cccp cpp
            cd .; `if [ -f /tmp/gcc-2.95.1/gcc/../bison/bison ] ; then
case . in \
            /*) echo /tmp/gcc-2.95.1/gcc/../bison/bison -L ./../bison/
;; \
            *) echo /tmp/gcc-2.95.1/gcc/../bison/bison -L
/tmp/gcc-2.95.1/gcc/./../bison/ ;; \
            esac; else echo bison ; fi`  -d -o c-parse.c c-parse.y
    sh[4]: bison:  not found.

bison is not available on the system and there is no bison directory
anywhere in the distribution tree.  Did I download the wrong tar file?
What am I doing wrong?