Hi, I'm running 3.09 MinGW. When trying to compile like this... ocamlopt.opt -warn-error A -I . -o A.opt unix.cmxa str.cmxa nums.cmxa libB.cmxa A.cmx ...I get this error... gcc: @F:\DOCUME~1\user\LOCALS~1\Temp\camlresp33a735: Invalid argument Error during linking When I fiddle around with it, I discover that the problems come when I add another object to be linked. This can be either my own binary or one of the Caml included libraries. Can anyone explain why this might be, and what I can do to remedy it? Jeremy