An explicit Depends on cpp would definitely be overkill, since it'll work with any suitable preprocessor -- the grompp man page even describes how to use it with m4.
I see now that grompp does not handle the *absence* of cpp (or a suitable alternative) gracefully, even if no preprocessor features are being used, but this can be solved by adding "-pp" to the grompp command line. The grompp error message without -pp is rather uninformative... I'll see about improving that too. -- Nicholas Breen [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]