Official website: https://github.com/shadowsocks/simple-obfs
First ssh into your VPS.
Enter systemctl stop shadowsocks-libev
to stop ss if it was running.
Run following commands according to the system of your VPS.
# Debian / Ubuntu
sudo apt-get install --no-install-recommends build-essential autoconf libtool libssl-dev libpcre3-dev libev-dev asciidoc xmlto automake
# CentOS / Fedora / RHEL