--- a/Makefile
+++ b/Makefile
@@ -20,11 +20,6 @@
   endif
 else
   DUNE_EXE=
-  # NB make does not export the PATH update in Makefile.config to $(shell ...)
-  ifeq ($(shell PATH='$(PATH)' $(DUNE) build --root . --help=plain 2>/dev/null \
-                  | grep -F -- '$(DUNE_PROMOTE_ARG) '),)
-    DUNE_PROMOTE_ARG =
-  endif
 endif
 
 OPAMINSTALLER = ./opam-installer$(EXE)