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-rw-r--r--pkgs/servers/x11/xorg/overrides.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index 93afa06a7f2..66f74f30549 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -75,6 +75,7 @@ in
         # Remove useless DocBook XML files.
         rm -rf $out/share/doc
       '';
+    CPP = stdenv.lib.optionalString stdenv.isDarwin "clang -E -";
   };
 
   libXfont = attrs: attrs // {