There is no problem with the version of GHC installed. Library pcre-light is importing unsafePerformIO from Foreign, module that doesn't export this function since version 4.7.0.0 of the base package. That causes the build to fail for users of base-4.7.0.0. Importing this function from System.IO.Unsafe solves the problem. I have written to the maintainer as well, but did not received any answer yet.

Regards,

Daniel Díaz.

On Sun, Apr 13, 2014 at 3:21 AM, Carter Schonwald <carter.schonwald@gmail.com> wrote:

please upgrace to 7.8.2 before trying to build anything, theres a *big* bug in 7.8.1 type checker

On Sat, Apr 12, 2014 at 9:09 PM, Nikolay Amiantov <nikoamia@gmail.com> wrote:

Hello,
I've tried the new ghc-7.8.1 and have had an issue with building pcre-light as one of dependencies for my project. I've made a patch which fixes this, but I can't reach maintainer by e-mail -- what can I do in this situation? Also, the second (unrelated) question would be: how can I find a package which depends on it in my project? I have found no way to dump a dependency tree in cabal.

Thanks in advance,
Nikolay.

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