Sandbox is NOT required for portage to function properly. As long as there is a FEATURE variable defined with sandbox keyword there might be a possibility to decide whether to use sandbox for portage or not. In worst/simplest case please put back sandbox USE flag. Reproducible: Always Steps to Reproduce: 1. emerge portage 2. required sandbox 3. Actual Results: sandbox compilation Expected Results: no sandbox required if not asked about. Gentoo MUST remain ALL ABOUT CHOICE distro, otherwise its existing is not justified.
the number of people who would want this can probably be counted on one hand. use package.provided to fake out the dependency on your system.