diff --git a/Makefile b/Makefile
index 2df847c3..7c2cda97 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 .PHONY: all install clean doc github
 
-EXT_OBJ=$(ocamlfind ocamlc -config | awk '/^ext_obj:/ {print $2}')
-EXT_LIB=$(ocamlfind ocamlc -config | awk '/^ext_lib:/ {print $2}')
+EXT_OBJ:=$(shell ocamlfind ocamlc -config | awk '/^ext_obj:/ {print $$2}')
+EXT_LIB:=$(shell ocamlfind ocamlc -config | awk '/^ext_lib:/ {print $$2}')
 
 OCAMLBUILD = ocamlbuild -use-ocamlfind -classic-display -no-links \
 	-cflags "-w A-4-33-40-41-42-43-34-44"
diff --git a/discover.ml b/discover.ml
index 80a009a5..a937fae5 100644
--- a/discover.ml
+++ b/discover.ml
@@ -39,7 +39,8 @@ module Flag = struct
 
   let check flag =
     let pkgs = String.concat " " flag.findlib_checks in
-    let cmd = sprintf "ocamlfind query %s 1>/dev/null 2>/dev/null" pkgs in
+    let null = if Sys.os_type = "Win32" then "NUL" else "/dev/null" in
+    let cmd = sprintf "ocamlfind query %s 1>%s 2>%s" pkgs null null in
     let res = Sys.command cmd = 0 in
     if verbose then
       printf "Checking %s(findlib: %s): %s\n%!"