--- menhir-20120123/Makefile.arch.orig	2012-09-28 19:03:09.673811200 +0200
+++ menhir-20120123/Makefile.arch	2012-09-28 19:07:38.680344000 +0200
@@ -1,7 +1,7 @@
 # If ocaml reports that Sys.os_type is Unix, we assume Unix, otherwise
 # we assume Windows.
 
-ifeq "$(shell rm -f ./o.ml && echo print_endline Sys.os_type > ./o.ml && ocaml ./o.ml && rm -f ./o.ml)" "Unix"
+ifneq "$(shell rm -f ./o.ml && echo print_endline Sys.os_type > ./o.ml && ocaml ./o.ml && rm -f ./o.ml)" "Win32"
 MENHIREXE    := menhir
 OBJ          := o
 else