How to include .m4 files in Autoconf?

Question

I have downloaded a macro from Autoconf Archive, and I want to use it. What do I have to put in my configure.ac file to make use this macro?

Answer 1

Isn't it enough to just save the m4 macro in certain directory and run autoreconf with the -I option:

autoreconf -i -I/path/to/your/m4/file

Or did I misunderstand you and do you want to integrate it permanently, without the person running autoreconf to worry about downloading the m4 file?