the correct rm macro in automake

Hi,

I am writing a install-exec-hook and the appropriate uninstall-hook. The 
former simply makes a copy of installed lib somewhere else, and the 
later needs to delete it. For that I simply wrote:

uninstall-hook:
   rm -f foo.so

What is the correct variable to ask for removal of a file. Is this $(rm) 
or something like this?

Thanks.