I did try to run startx from the Gentoo installer, but it isn't available. Command-line partitioning isn't the problem, per se, it's the lack of manual config

I did try to run startx from the Gentoo installer, but it isn't available. Command-line partitioning isn't the problem, per se, it's the lack of manual config options. Zenwalk (Slackware) has a command-line installer, and that detected my existing partitions correctly and let me install.