Problem building on solaris 9

[Gedaliah Wolosh]

Make fails --

bison -y  getdate.y
conflicts: 4 shift/reduce
bison: I/O error
make[2]: *** [getdate.c] Error 1
make[2]: Leaving directory `/opt/home/gwolosh/krb5-1.3/src/kadmin/cli'
make[1]: *** [all-recurse] Error 1
make[1]: Leaving directory `/opt/home/gwolosh/krb5-1.3/src/kadmin'
make: *** [all-recurse] Error 1

Any help would be greatly appreciated.
Thanks
--Gedaliah