diff --git a/config/functions b/config/functions
index 5f0862114f..dbfd6e886b 100644
--- a/config/functions
+++ b/config/functions
@@ -141,6 +141,9 @@ setup_toolchain() {
       export CXX_FOR_BUILD="$CXX"
       export BUILD_CC="$CC"
       export BUILD_CXX="$CXX"
+      export _python_sysroot="$TOOLCHAIN"
+      export _python_prefix=/
+      export _python_exec_prefix=/
       ;;
   esac
 }