[texhax] broken footnotes

[Jim Haynes]

I did a fresh install of Fedora 21 recently.  I installed a whole bunch
of texlive packages from the Fedora repository, mostly having to hunt and
peck because there don't seem to be any dependencies in the packages.

When I got all done my latex sources that involve footnotes are broken.
When it gets to a \footnote{...} item I get

! Math formula deleted: Insufficient extension fonts.
\@ensuredmath #1->$\relax #1$

l.60 ...tnote{ actually 500 characters per minute}

?

Am I missing some necessary texlive package?

(I don't know much about TeX/LaTeX, just enough to get into trouble)