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So basically in my project I need to use batteries (for File.lines_of and other related functions) and deriving (for Show.show) at the same time.

However, when I use opam to install package deriving on my Mac, it seems that it will firstly remove the batteries package, after that it will start to install deriving..

and when install batteries using opam, it will firstly remove deriving...

Is there anything wrong with my configuration..? Or it is just the normal case..? THen how can I use batteries and deriving at the same time?

enter image description here

lllllllllllll
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    Please provide output of `opam install deriving batteries`. Writing both at the same time should cause opam to state that the constraint is unsolvable, if indeed the two libraries are incompatible. Also, just give text output; no good reason for a screenshot for plain text. – Ashish Agarwal Apr 28 '14 at 11:50
  • @AshishAgarwal OMG... `opam` didn't claim any inconsistent and successfully install both two packages... thank you... but anyway, why I can't install deriving and batteries one by one using `opam`..? – lllllllllllll Apr 28 '14 at 13:50
  • The solver doesn't get things quite right sometimes. There has been a lot of work to improve things. See [here](https://sympa.inria.fr/sympa/arc/caml-list/2014-04/msg00138.html). – Ashish Agarwal Apr 28 '14 at 17:33

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  • I've had no problem installing both libraries (batteries 2.1.0 and deriving 0.5) with OCaml 4.00.1 (and Opam 0.9.6)

  • You might want to check this question: opam upgrade wants to downgrade a bunch of packages -- not sure whether this is relevant, but it seems that it might be.

Good luck!

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