macOS 11.0.1 "Big Sur" compilation problem

[lancelet]

On macOS "Big Sur", I'm seeing the following issue when compiling GLFW-b:

$ sw_vers
ProductName:	macOS
ProductVersion:	11.0.1
BuildVersion:	20B29

$ cabal build
Build profile: -w ghc-8.10.2 -O1
In order, the following will be built (use -v for more details):
 - GLFW-b-3.3.0.0 (lib) (first run)
Preprocessing library for GLFW-b-3.3.0.0..
Building library for GLFW-b-3.3.0.0..
[1 of 3] Compiling Graphics.UI.GLFW.Types ( Graphics/UI/GLFW/Types.hs, /Users/jsm/workspace/GLFW-b/dist-newstyle/build/x86_64-osx/ghc-8.10.2/GLFW-b-3.3.0.0/build/Graphics/UI/GLFW/Types.o, /Users/jsm/workspace/GLFW-b/dist-newstyle/build/x86_64-osx/ghc-8.10.2/GLFW-b-3.3.0.0/build/Graphics/UI/GLFW/Types.dyn_o )
<command line>: can't load framework: AGL (not found)

My first thought was that perhaps AGL had been removed from "Big Sur", but:

$ ls -l /System/Library/Frameworks | grep AGL
drwxr-xr-x  4 root  wheel  128  1 Jan  2020 AGL.framework

This has also shown up in recent builds of ad-si/Perspec; eg: https://github.com/ad-si/Perspec/runs/1412857351?check_suite_focus=true

[lancelet]

This could be a more general GHC problem; see: https://gitlab.haskell.org/ghc/ghc/-/issues/18446