Still not supported, I have installed latest libressl 2.7.0 release and having problems with steam now on Ubuntu 16.04.4 LTS fresh one installation.
in fact, steam is working fine on my libressl system the last 5 months, so I'm closing this one
Nothing extracted yet.
Your system information
Steps for reproducing this issue:
Steam can crash randomly or simply not just work when you use a libreSSL system, as-a-example https://github.com/voidlinux/void-packages/issues/1115
LibreSSL is a fork of OpenSSL that tries to be safer/less bloated which has proven to be a sucess