I have made available a build of GHC 8.2.2 with the config option: --disable-large-address-space You may find this useful if you are using Ubuntu 16.04 on Windows Subsystem for Linux. https://github.com/zoominsoftware/ghc-8.2.2-wsl Although Microsoft has been making gradual progress on the large address mapping issue[1][2], and the situation is much improved, there is still an extra startup latency of about 13 secs. for applications that pre-map a large address space as GHC does by default. This makes the standard GHC 8.2.2 binary unusable for compiling projects of any non-trivial size on WSL. You may find this GHC 8.2.2 binary more usable. Regards, Yitz [1] https://ghc.haskell.org/trac/ghc/ticket/13304 [2] https://github.com/Microsoft/WSL/issues/1671