/usr/share/gerris/gfs.sty is in gerris-mpi 20131206+dfsg-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | \newcommand{\gfsweb}{http://gfs.sf.net}
\newcommand{\htmladdnormallinkfoot}[2]{\footahref{#2}{#1}}
\newcommand{\htmladdnormallink}[2]{\ahref{#2}{#1}}
\newcommand{\video}[3]{\includegraphics[scale=0.5]{#1.eps}}
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