Can't find/run `configure` script on mac os 10.8
That's the typical sequence of build steps for many cross-platform Open Source projects.

The configure command should be part of your downloaded package, so assuming your package is called CsimOSS you should


open up your Terminal
change to the CsimOSS folder (e.g. cd + dropping the folder into the Terminal window)
enter ./configure


The ./ in front of configure tells the shell to look for the command in the current directory (which is usually not in the standard search PATHs for security reasons).