* Add package for multitail@6.4.2
Lightly tested on CentOS 7.
* Responde to feedback/comments
Use `install_targets` to specify PREFIX= and DESTDIR= instead of
hacking away at the Makefile. Expand commentary about "Why?".
Use `headers.include_flags` and `libs.ld_flags` to avoid explicitly
setting `-L` and `-I` when hacking away at the Makefile.