I'm on MacOS Sierra. I'm using stack, but I also sometimes use the system GHC for situations where stack is problematic (one of my applications spawns GHC as part of a work-loop cycle and it's faster to run the system GHC). My system GHC is 8.4.2. I just started getting an error on compilation with the system GC: clang: error unknown argument: -no-pie Does I just need to update the system GHC or is this a symptom of something deeper? D