16.2 Handling new file extensions
It is sometimes useful to introduce a new implicit rule to handle a file
type that Automake does not know about. If this is done, you must
notify GNU Make of the new suffixes. This can be done by putting a list
of new suffixes in the `SUFFIXES' variable.
For instance, currently Automake does not provide any Java support.
If you wrote a macro to generate `.class' files from `.java' source
files, you would also need to add these suffixes to the list:
SUFFIXES = .java .class
automatically generated byinfo2html