mongodb/mongo — pull request #286 by Kwasniewski (2012-08-10 19:20:59+00:00)
Title: Fixing typo introduced in b3f4d6c4b7aab682376a4503d6f76d698d08d799

The command should use --prefix not -prefix.

Using -prefix fails because it is trying to use the flags p r e f i x instead of setting the prefix.