How do I install a LaTeX .sty file on OSX?

Question

I have a LaTeX project set up:

tex/
  - documents/
      - some_file.tex
  - support/
      - todonotes.sty

where some_file.tex us

Answer 1

This page on LaTeX packages says you'll need to install the .sty file in the LaTeX installation directory (my installation of Ubuntu seems to be /usr/share/texmf-texlive/tex/latex/), or you need to have a copy of the .sty file in each file containing LaTeX source -- i.e. in your tex/documents folder, at the very least.