any ideas - Compiling INND 2.3.3 is failing

[Wilson, Sue LCC]

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./endian >../include/autoconfig.h
gcc -g -O2 -I../include   -c md5.c
gcc -g -O2 -I../include   -c nonblocking.c
Expect 6 shift/reduce conflicts
yacc parsedate.y
make[1]: yacc: Command not found
make[1]: *** [parsedate.c] Error 127
make[1]: Leaving directory `/opt/share/src/inn-2.3.3/lib'
make: *** [all-lib] Error 2

The system  is running gcc version gcc version 3.2 and  GNU Make version
3.79.1

also failed with gcc version 2.95