问题
I have installed Haskell platform and I have the 7.10.3 version of ghci, which has the 4.8.2.0 version of base. I need to install gloss-1.8.* which needs base-4.7.* version of base.
My question is how to install this older version now, when I already have the newer version. Is it possible? Or do I have to uninstall the Haskell platform and install an older version?
来源：https://stackoverflow.com/questions/37195188/how-to-install-an-older-version-of-base-in-haskell