External interpreter fails on FreeBSD

On FreeBSD 11,

$ inplace/bin/ghc-stage2 -fexternal-interpreter --interactive
GHCi, version 8.3.20170722: http://www.haskell.org/ghc/  :? for help
{handle: <file descriptor: 12>}: GHCi.Message.remoteCall: end of file

Edited Mar 10, 2019 by Ben Gamari

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External interpreter fails on FreeBSD