GHC should integrate better with mingw
When developing in Windows, it is very common to require many more tools than what's available with GHC. I have myself used
Also, when installing libraries/headers for mingw/msys and are going to use them with GHC, the only way to get them linked is to copy them to GHC installation as well. So, I'd really like if I could tell GHC via flag or preferably via configuration file. But GHC would probably need to organize the includes and archives differently than it does now.
Configuring via files would also allow Cabal to make use of these tools without much extra fiddling.