diff --git a/Rsconscript b/Rsconscript
index 9c5c2dc..e700701 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -1,6 +1,7 @@
 configure do
   check_program "mformat"
   check_program "x86_64-w64-mingw32-gcc"
+  check_cfg package: "gnu-efi", use: false
 end
 
 class Image < Builder