wip(build): target macOS 12

flake.nix

@@ -18,10 +18,10 @@
             # works out of the box without the user having to manually set
             # TERMINFO in the shell before launching emacs.
             packages = with pkgs; [
-              # Target macOS 11 SDK, allowing Emacs builds to work on macOS 11
+              # Target macOS 12 SDK, allowing Emacs builds to work on macOS 12
               # and later, even when the build system is running a later macOS
               # version.
-              apple-sdk_11
+              apple-sdk_12
               autoconf
               cairo
               clang
@@ -71,8 +71,8 @@
 
             shellHook = ''
             export CC=clang
-            export MACOSX_DEPLOYMENT_TARGET="11.0"
-            export DEVELOPER_DIR="${pkgs.apple-sdk_11}"
+            export MACOSX_DEPLOYMENT_TARGET="12.3"
+            export DEVELOPER_DIR="${pkgs.apple-sdk_12}"
             export NIX_LIBGCCJIT_VERSION="${pkgs.libgccjit.version}"
             export NIX_LIBGCCJIT_ROOT="${pkgs.libgccjit.outPath}"
           '';