I'm not sure if this is the right place for this, but I've repeatedly run into issues when installing packages through cabal. It complains about missing C libraries and then explains that I can solve the problem by "installing the system package that provides this library". This has never worked for me and so I assume I'm not doing it correctly. For example, I am currently trying to install ftgl. Using --extra-include-dirs and --extra-lib-dirs to point at the lib and include of the c source folder of ftgl doesn't seem to work. Neither did putting the dll's in the path. The tutorial linked from the wiki:[ https://noamlewis.wordpress.com/2012/12/16/cabal-install-ftgl-on-windows-and... ] also doesn't work for me. And so I was wondering if anyone has had more recent success with that library and more generally if there were any suggestions as to what I might be doing wrong.