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The linear solvers MA57 and MUMPS can make use of the matrix ordering algorithms implemented in METIS (see http://glaros.dtc.umn.edu/gkhome/metis/metis/overview). If you are using one of those linear solvers, you should obtain the METIS source code and put it into $IPOPTDIR/ThirdParty/Metis. Read the INSTALL.Metis file in that directory, and if you have the wget utility installed on your system, you can download the code by running the ./get.Metis script.