xmllint

I recently upgraded to osx lion and when I now try to use xmllint I get the following error:

Wilberts-MacBook-Pro:mess-trunk wilbert$ xmllint

Launch of "xmllint" failed: the PowerPC architecture is no longer supported.

Wilberts-MacBook-Pro:mess-trunk wilbert$ which xmllint

/opt/local/bin/xmllint

How do I fix this?