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-rw-r--r--pkgs/servers/x11/xorg/overrides.nix10
1 files changed, 8 insertions, 2 deletions
diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index 93afa06a7f2..4811659ac41 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -69,12 +69,15 @@ in
   };
 
   libX11 = attrs: attrs // {
-    preConfigure = setMalloc0ReturnsNullCrossCompiling;
+    preConfigure = setMalloc0ReturnsNullCrossCompiling + ''
+      sed 's,^as_dummy.*,as_dummy="\$PATH",' -i configure
+    '';
     postInstall =
       ''
         # Remove useless DocBook XML files.
         rm -rf $out/share/doc
       '';
+    CPP = stdenv.lib.optionalString stdenv.isDarwin "clang -E -";
   };
 
   libXfont = attrs: attrs // {
@@ -99,8 +102,11 @@ in
   # Note: most of these are in Requires.private, so maybe builder.sh
   # should propagate them automatically.
   libXt = attrs: attrs // {
-    preConfigure = setMalloc0ReturnsNullCrossCompiling;
+    preConfigure = setMalloc0ReturnsNullCrossCompiling + ''
+      sed 's,^as_dummy.*,as_dummy="\$PATH",' -i configure
+    '';
     propagatedBuildInputs = [ xorg.libSM ];
+    CPP = stdenv.lib.optionalString stdenv.isDarwin "clang -E -";
   };
 
   # See https://bugs.freedesktop.org/show_bug.cgi?id=47792