[Freebsd-haskell] Cabal segfaults after update to GHC-7.10.2 from ports

Hello, I just updated my Haskell installation in FreeBSD 11 to GHC 7.10 using the ports tree. I am now seeing segfaults from cabal whenever I try to install anything, or even update the package list. Curiously, port builds of Haskell packages seem to work just fine, which leads me to believe the problem is in one of the dependencies as opposed to cabal itself. Also, I can manually compile and run simple programs. I tried various settings (LLVM/no, profile on/off, dynamic on/off) to no avail. Has anyone else seen this? Any advice on how to go about diagnosing the problem?