diff --git a/core/envsetup.mk b/core/envsetup.mk
index 4456809..e8fa6a7 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -54,6 +54,8 @@
   HOST_OS := darwin
 endif
 
+HOST_OS_EXTRA:=$(shell python -c "import platform; print(platform.platform())")
+
 # BUILD_OS is the real host doing the build.
 BUILD_OS := $(HOST_OS)