Does anyone know where I can get this "language optional software package"? or do i have to install gcc.

# make
Checking distribution of files
./pgms exists
./src exists
./testdir exists
./doc exists
/tmp exists
./results exists
gcc -o ./pgms/arithoh -DTIME -O -Darithoh ./src/arith.c
/usr/ucb/cc: language optional software package not installed
*** Error code 1
make: Fatal error: Command failed for target `pgms/arithoh'