1. download the binary for linux

$ wget https://github.com/purescript/purescript/releases/download/v0.11.5/linux64.tar.gz - /opt/purescriptw
  1. $ ln -s /opt/purescript/purs /usr/local/bin/purs
    
  2. install libtinfo

    $ gpg --keyserver pgp.mit.edu --recv-keys F7E48EDB # needed for the folloing package
    $ pacaur -S ncurses5-compat-libs
    $ pacaur -S libtinfo
    

    see here