Drupal 7 and Gentoo

I was wondering about huge changes in Drupal core, so I tried to install D7 development 9 (September 15th). However, the documentation of D7 doesn't currently describe few issues you may encounter when using Gentoo.

Remember: You have to enable these USE flags for dev-lang/php: pdo, json, filter if you want to properly set up D7 and test its new features:)

Edit:

If You want install D7 with sqlite database support You need to enable "sqlite" flag as well.

Wow, D7 works with sqlite!