So I know that I can put at the first or second line of a file a line such as:
# -*- mode: conf -*-
to tell Emacs what major mode I want the file to be opened with.
But if that mode isn't installed I wish Emacs to fallback to a different mode. For example I wish to use the apache-mode, but if it doesn't exist I wish to fallback to conf-mode.
Is this possible, and if so how?