## Summary When running on macOS Big Sur, attempting to load a system framework at runtime fails with a `not found` error. ## Steps to reproduce Create a file called `Main.hs` with the following content: ```haskell module Main where main = putStrLn "Hi." ``` Run it with `runghc`, passing `-framework OpenGL` to GHC: ```bash runghc --ghc-arg="-framework OpenGL" Main.hs ``` ## Expected behavior The program should run and say hi. ## Environment * GHC version used: 8.10.1 * Operating System: macOS 10.16 Big Sur (20A4300b) * System Architecture: x86_64 ## Proposed Fix Merge request !3689 is a proposed fix. ## Remarks This is presumably due to the following change in macOS Big Sur: > New in macOS Big Sur 11 beta, the system ships with a built-in > dynamic linker cache of all system-provided libraries. As part of > this change, copies of dynamic libraries are no longer present on > the filesystem. Code that attempts to check for dynamic library > presence by looking for a file at a path or enumerating a directory > will fail. Instead, check for library presence by attempting to > dlopen() the path, which will correctly check for the library in the > cache. (62986286) (https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes/) The fix proposed above implements the behavior suggested there.