diff -ru orig/src/main/Main.hs new/src/main/Main.hs
--- orig/src/main/Main.hs	2013-10-14 09:10:24.895239824 +0300
+++ new/src/main/Main.hs	2013-10-14 09:10:24.000000000 +0300
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RecordWildCards  #-}
 -- | Main compiler executable.
@@ -15,6 +16,9 @@
 import           Data.Maybe
 import           Data.Version        (showVersion)
 import           Options.Applicative
+#if MIN_VERSION_optparse_applicative(0,6,0)
+import           Options.Applicative.Types
+#endif
 import           System.Environment
 
 -- | Options and help.
@@ -119,8 +123,13 @@
   <*> switch (long "typecheck-only" <> help "Only invoke GHC for typechecking, don't produce any output")
   <*> optional (strOption $ long "runtime-path" <> help "Custom path to the runtime so you don't have to reinstall fay when modifying it")
 
+
   where strsOption m =
+#if MIN_VERSION_optparse_applicative(0,6,0)
+          nullOption (m <> reader (ReadM . Right . wordsBy (== ',')) <> value [])
+#else
           nullOption (m <> reader (Right . wordsBy (== ',')) <> value [])
+#endif
 
 
 -- | Make incompatible options.