Today I am happy to announce the release of H2O version 1.6.1. The release fixes two build-related issues found in 1.6.0 (link: release notes).
Among them, one is a build error on ARMv8-A, i.e. the 64-bit ARM architecture.
Yes, we now officially support 64-bit ARM!
In late 2015 we have started to see 64bit ARM-based servers / appliances hit the market, and it is likely that we would see more in the coming year.
I hope that H2O will be the best HTTP server for the platform.
EDIT. Personally I am enjoying using Geekbox, a sub-$100 microserver with an octa-core Cortex-A53 processor running Ubuntu :)