Anything I install in /usr/local is stuff is going to be something I really need, and for which there isn't a distro package. It stays for the life of the system.
If I wanted to install something into /usr/local that would be suspected of needing removal later, I'd build it with /usr/local as a prefix, but install it in a temporary directory, then make a tarball package out of that to keep track of the file list. That could be used to remove it. I could trivially generate an uninstall script by using find in the package directory to get a list of relative paths; converting each to a rm command. The uninstall script would be put into /usr/local and run from there.
> If I wanted to install something into /usr/local that would be suspected of needing removal later, I'd build it with /usr/local as a prefix, but install it in a temporary directory, then make a tarball package out of that to keep track of the file list. That could be used to remove it. I could trivially generate an uninstall script by using find in the package directory to get a list of relative paths; converting each to a rm command. The uninstall script would be put into /usr/local and run from there.
Compared to using stow, this is two orders of magnitude more complicated :-) With stow, you simply install it anywhere, and stow will make the symlinks into /usr for you. When you want to uninstall it, stow will remove all the symlinks. This way, I would install each package into its own directory. When I want to remove it, I use stow to delete all the symlinks, and then just delete the directory.
It's only theoretical; I've never uninstalled anything out of a /usr/local.
What Stow is doing, by the way, is better achieved with overlayfs, which didn't exist when Stow was first introduced.
With overlayfs you can specify multiple directories that are merged together. Multiple packages that are rooted at /usr/local can be mapped there with overlayfs.
If I wanted to install something into /usr/local that would be suspected of needing removal later, I'd build it with /usr/local as a prefix, but install it in a temporary directory, then make a tarball package out of that to keep track of the file list. That could be used to remove it. I could trivially generate an uninstall script by using find in the package directory to get a list of relative paths; converting each to a rm command. The uninstall script would be put into /usr/local and run from there.