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gentoo:quickpkg

Let's assume you upgrade from package/foo-1.0 to package/foo-1.1. You can then use quickpkg to create a backup of foo-1.0, upgrade with `emerge -ua foo`, and test it. If you are not satisfied, mask the updated version in /etc/portage/package.mask, and `emerge -uak foo` again in order to downgrade. -k tells emerge to use the binary package built with quickpkg instead of re-compiling.

```# Make binary package
quickpkg foo # (or quickpkg package/foo-1.0)