--- libraries/Cabal/Cabal/Distribution/System.hs.orig	2018-09-18 12:47:25.578736000 +0000
+++ libraries/Cabal/Cabal/Distribution/System.hs	2018-09-18 12:50:02.454390000 +0000
@@ -64,7 +64,8 @@
 -- ------------------------------------------------------------
 
 data OS = Linux | Windows | OSX        -- tier 1 desktop OSs
-        | FreeBSD | OpenBSD | NetBSD   -- other free unix OSs
+        | BSDSUniX | FreeBSD | OpenBSD -- other free unix OSs
+        | NetBSD                       -- other free unix OSs
         | Solaris | AIX | HPUX | IRIX  -- ageing Unix OSs
         | HaLVM                        -- bare metal / VMs / hypervisors
         | IOS                          -- iOS
@@ -77,7 +78,7 @@
 -- e.g. should we have os(linux) && os(android) true simultaneously?
 
 knownOSs :: [OS]
-knownOSs = [Linux, Windows, OSX
+knownOSs = [Linux, Windows, OSX, BSDSUniX
            ,FreeBSD, OpenBSD, NetBSD
            ,Solaris, AIX, HPUX, IRIX
            ,HaLVM