Can I delete a commit in Subversion?

Per accident I committed twice because I forgot to add two files. Can I remove a specific commit from the log?

I want to delete commit № 4.

The simple answer is "no", because Subversion doesn't know how to resolve the case when you add a commit, someone else updates their checkout, and then you remove the commit from history. There might or might not be a complex answer involving surgery on the Subversion storage.