The x11-libs/libX11-1.4.4 ebuild marks the package as requiring >=x11-proto-7.0.13, but in fact >=x11-proto/xproto-7.0.17 is required. Reproducible: Always Steps to Reproduce: 1. Have <x11-proto-7.0.16 installed 2. Emerge x11-libs/libX11-1.4.4 Actual Results: The configure failed, noting that the xproto version is too old. Expected Results: The configure should have succeeded. This may be true of the other versions as well; I didn't check. I got to this situation while attempting to emerge @world on a machine that hasn't been upgraded in a while, xproto was to be upgraded, but only after libX11. Manually upgrading xproto solved the problem.
Fixed. Thanks!