arm/nyx doesn't install on systems with python3.x by default
./install fails with this super-cryptic output:
print "TorCtl successfully installed" ^
SyntaxError: invalid syntax
The hotfix was to edit the install script and put "python2" instead of "python". Other distros of course may need it differently and I was told there is a way of supporting python versions properly.
Also, it is a bit rough style to install into /usr as if it was an apt-get. Manually installed stuff usually goes to /usr/local to not confuse the package management of whatever OS. In my case I would have wanted to provide my own prefix.