26a27
> let additional_dependencies = ref ([] : string list)
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> let add_to_dependencies file = 
>   additional_dependencies := file :: !additional_dependencies
> 
> let dependency_exists file = 
>   List.mem file !additional_dependencies || Sys.file_exists file
> 
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<   find_in_path !load_path
---
>     if      List.mem name  !additional_dependencies then name
>     else if List.mem uname !additional_dependencies then uname
>     else    find_in_path !load_path
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< let usage = "Usage: ocamldep [-I <dir>] [-native] <files>"
---
> let usage = "Usage: ocamldep [-I <dir>] [-f <file>] [-native] <files>"
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>      "-f", Arg.String add_to_dependencies,
>        "<file> Generate dependencies against <file> even if it doesn't exist";