# AMPL Installation Wizard

Here are instructions to add or upgrade Gurobi Solver to an existing AMPL installation on macOS:

1. Determine the directory where AMPL is installed on your computer.
2. Extract the contents of the supplied Gurobi Solver file. Extraction is done with the following command:

       tar xvfz amplgurobilink11.0.2_mac64.tar.gz

   The file name should be adjusted to reflect the actual archive file. Extraction will produce a subdirectory called `ampl`, which contains the Gurobi Solver software.
3. Copy the extracted files inside the `ampl` subdirectory to the directory where AMPL is installed on your computer.
4. To allow the AMPL-Gurobi executable files to be found when needed, ensure that the `PATH` environment variable includes the AMPL installation directory. Assuming that AMPL is installed in `/usr/local/bin`, users of the bash shell would add the following to their .bashrc files:

       export PATH="${PATH}:/usr/local/bin"

   And users of the csh shell would add the following to their .cshrc files:

       setenv PATH ${PATH}:/usr/local/bin