Mediawiki Math



I am running Mediawiki on my web site.
I would like to use the TEX math extension.
After running make in the math sub directory,
I get the following error when displaying a page with
I = \frac{P}{A} = \cfrac{P}{4pr^2}
in the source.

Failed to parse (Missing texvc executable; please see math/README to configure.): I = \frac{P}{A} = \cfrac{P}{4pr^2}

What am I doing wrong?