diff --git a/boot/script-loader/mruby-lvgui-native/lvgui.nix b/boot/script-loader/mruby-lvgui-native/lvgui.nix
index 29b280be..b6d9bfaa 100644
--- a/boot/script-loader/mruby-lvgui-native/lvgui.nix
+++ b/boot/script-loader/mruby-lvgui-native/lvgui.nix
@@ -9,8 +9,6 @@
 , withSimulator ? false
 }:
 
-let stdenv = pkgs.stdenvAdapters.keepDebugInfo pkgs.stdenv; in
-
 let
   inherit (lib) optional optionals optionalString;
   simulatorDeps = [
@@ -127,10 +125,6 @@ in
     ++ optionals withSimulator simulatorDeps
     ;
 
-    NIX_CFLAGS_COMPILE = [
-      "-DX_DISPLAY_MISSING"
-    ];
-
     makeFlags = [
       "PREFIX=${placeholder "out"}"
     ]