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Try Just running smw from command line. If that runs you know it is in your or your es_systems.cfg

In my second post there is a link to the smw forums post that helped me fix a glitch in the game as you compiled it. You may want to check that out as well after you get this working. What version of RetroPie are you on? I did this on a Pi2 version 3.0beta2, though it should work on any version in theory.