1 files changed, 6 insertions, 0 deletions
diff --git a/pkgs/development/compilers/llvm/12/libcxx/default.nix b/pkgs/development/compilers/llvm/12/libcxx/default.nix
index 3ddcb799750..30dc3f4f206 100644
--- a/pkgs/development/compilers/llvm/12/libcxx/default.nix
+++ b/pkgs/development/compilers/llvm/12/libcxx/default.nix
@@ -23,6 +23,12 @@ stdenv.mkDerivation {
     ../../libcxx-0001-musl-hacks.patch
   ];
 
+  # Prevent errors like "error: 'foo' is unavailable: introduced in macOS yy.zz"
+  postPatch = ''
+    substituteInPlace include/__config \
+      --replace "#    define _LIBCPP_USE_AVAILABILITY_APPLE" ""
+  '';
+
   preConfigure = lib.optionalString stdenv.hostPlatform.isMusl ''
     patchShebangs utils/cat_files.py
   '';