dh_auto_clean is a debhelper program that tries to automatically clean up after a package build. It does
so by running the appropriate command for the build system it detects the package uses. For example, if
there's a Makefile and it contains a distclean, realclean, or clean target, then this is done by running
make (or MAKE, if the environment variable is set). If there is a setup.py or Build.PL, it is run to
clean the package.
This is intended to work for about 90% of packages. If it doesn't work, or tries to use the wrong clean
target, you're encouraged to skip using dh_auto_clean at all, and just run makeclean manually.