--- libraries/Cabal/Cabal/Distribution/Simple/PreProcess.hs.orig	2018-09-18 12:45:12.649627000 +0000
+++ libraries/Cabal/Cabal/Distribution/Simple/PreProcess.hs	2018-09-18 12:46:08.024403000 +0000
@@ -544,6 +544,7 @@
                     Linux     -> ["linux"]
                     Windows   -> ["mingw32"]
                     OSX       -> ["darwin"]
+                    BSDSUniX  -> ["bsdsunix"]
                     FreeBSD   -> ["freebsd"]
                     OpenBSD   -> ["openbsd"]
                     NetBSD    -> ["netbsd"]