/home/fgregg/share/texmf/tex/latex/pgf/basiclayer/pgf.sty
/usr/share/texmf/tex/latex/pgf/pgf.sty

•  bibtex directory    This is where bib files and bst files go
     ⁃  bst directory       Put bst files here
     ⁃  bib directory       Put bib files here
  •  tex directory       This is where new packages go
     ⁃  latex directory     Put latex packages here
     ⁃  plain directory     Put plain tex files here
     ⁃  xelatex directory   Put xelatex specific packages here
     ⁃  xetex  directory    Put plain xetex files here
     ⁃  context directory   Put context files here
     ⁃  generic directory   Put files that are usable with any TeX flavour here
  •  doc directory
     ⁃  put documentation files from packages installed in the tex directory here.
        Putting the documentation files here allows them to be found by the texdoc
        system.