Oh, I forgot to tell everybody that I got it working by doing what anil said.

On Mon, Aug 31, 2015 at 10:42 PM, Yaron Minsky <yminsky@janestreet.com> wrote:
In particular, Async_kernel has supplanted Async_core.

y

On Fri, Aug 28, 2015 at 3:18 PM, Anil Madhavapeddy <anil@recoil.org> wrote:
> On 28 Aug 2015, at 19:46, Kenneth Adam Miller <kennethadammiller@gmail.com> wrote:
>>
>> So, in opam I've hit this problem - I need a package, but it's requirements conflict with another package that I have. Just typing opam install the_package will fail with "No package matches the_package". the_package is async_core
>>
>> I used the cudf solver farm remotely after hunting  the bug, but as far as this goes, I don't know what to do because I don't have control over those packages or their versions. I can maybe update my version of core (if the upgrade is compatible with a package that I have that uses it).
>>
>> Any advise for the error below?
>
> Async_core was deprecated some time ago, and is no longer part of the Core suit as far as I know.  Have you tried simply uninstalling Async_core to remove the dependency, and then install the package you want?
>
> -anil
>
>
> --
> Caml-list mailing list.  Subscription management and archives:
> https://sympa.inria.fr/sympa/arc/caml-list
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs