Hello!

Is there a ticket for that already on GHC Trac? If not, please create
one, and try to document everything we already know about this issue

On 2014-09-20 at 14:25:56 +0200, member MP2E wrote:
> Symlinking lib64 to lib didn't seem to work, I think the directory is
> getting cleared before build. But if I copy the contents of lib64 to lib
> after the build fails and then type make again, ghc compiles!
>
> Thanks for the workaround, hopefully a real fix will be found soon enough :)
>
> On Sat, Sep 20, 2014 at 4:18 AM, Moritz Angermann <moritz@lichtzwerge.de>
> wrote:
>
>> While this is not a proper fix. Assuming there is no no lib folder, and
>> the proper lib is in lib64, does: symlinking lib64 to lib and continuing
>> with make solve the issue?
>>
>> On Sep 20, 2014, at 12:32 PM, member MP2E <mp2e@archlinux.us> wrote:
>>
>> > Yep, I reported this same build error for NixOS on x86_64, unfortunately
>> I haven't found any way to solve it. Reverting the commit that upgrades to
>> libffi-3.1 still showed this issue. I'd love to see this fixed, as I am
>> unable to do any development on GHC until it's fixed :(