% If you want to use arara, you need the following directives:
 % arara: pdflatex: { synctex: on }
 % arara: makeglossaries
 % arara: pdflatex: { synctex: on }
\documentclass{article}
\usepackage{siunitx}
\usepackage[style=long4col]{glossaries}
\makeglossaries
\newglossaryentry{ohm}{%
  name=ohm,
  symbol={\si{\ohm}},
  description=unit of electrical resistance%
}
\begin{document}
\glsaddallunused
\printglossaries
\end{document}