$ ebuild bumblebee-3.0-r1.ebuild --force unpack The following REQUIRED_USE flag constraints are unsatisfied: || ( video_cards_nouveau video_cards_nvidia ) It would be great if it could just unpack the file with --force. It's unlikely that unsatisfied REQUIRED_USE would actually cause problems with that, esp. considering that 'ebuild' doesn't even check dependencies...
Yeah, a warning message should be sufficient.
Although, we should probably block commands like 'package' and 'merge', to prevent installation with invalid USE state.