reg:rm -R is not working

I am installing the my package in SCO unix 5.0 .so it will create some temporary directories and files and same will delete.So , 'rm -R ' is not working in system .in the package only it has given this command,so now without this command working we can not go forward.
so kindly help in this regards.
while tying
#rm -R hom (say hom is a directory)
usage [-rf ]
rm:hom is directory

No such thing as "rm -R". "rm -r" will recursively delete.