using c-macro-expand

[Kevin Dziulko]

When I run to c-macro-expand command, I get the following:

----------------------------------------
/* Preprocessor terminated with status 1

   Messages from `/lib/cpp -C ':

/lib/cpp: Command not found


*/

Preprocessor produced no output
----------------------------------------

I'm running GNU Emacs 20.2.3 (sparc-sun-solaris2.6, X toolkit).
I don't know what cpp -C is. Do I need to set a path to my
c compiler (/usr/ucb/cc) or something?

Thanks!
Kevin