If I choose to not use it, what functionality will not work?
Then I was told we were going to be building the project with the Gumby framework. Gumby documentation says it needs Compass and Modular Scale and provides gem-installation instructions. I followed the instructions for install. Turns out Compass doesn't work with sourcemaps, but installing the latest Compass alpha build does work with sourcemaps. Yay.
However when I tried to compile the Gumby files I hit the error I mentioned previously. Even installing the latest Modular-scale alpha build failed. I rolled back my installations to the Production versions for everything and it compiled, but I lost the Sourcemaps.
Its not impossible to work without sourcemaps and I'm getting by. Thanks for your help guys.