Hey, I’m currently maintaining serval packages on the AUR which are all implementations of djb’s redo, an incremental build system. However there are minor differences between all those implementations, and as djb never wrote one himself there is no "offical" one. That’s why I decided to give the packages unique names like "redo-sh" and let them all provide "redo" in their PKGBUILD.
Coming from Debian I’m familiar with the concept of virtual packages like www-browser, which makes it easy do specify a general dependency without getting to specific about it. As there some programs out there which use redo’s .do files in their building process it’s important that they can specify redo, or any of the existing implementations in their makedepends. But as far as I know there is no way to specify either package A OR B as a dependency for package C, so I came to the conclusion that using such a virtual package would make perfect sense and is the only valid option here. I already saw that "sh" is used like this, but I found no official resources on how Arch or the AUR handles such cases. Also someone just recently created a "redo" package which is in fact just one of the many implementations, which I find kinda problematic. Especially if somebody doesn’t know about the current status of the redo ecosystem. So if anybody knows about the modus operandi in such cases I’d be glad to hear about it. Regards, Felix  http://cr.yp.to/redo.html  https://aur.archlinux.org/packages/redo-sh  https://wiki.archlinux.org/index.php/PKGBUILD#provides  https://www.debian.org/doc/debian-policy/ch-binary.html#s-virtual_pkg  https://packages.debian.org/jessie/www-browser
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