diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -112,7 +112,7 @@
         addOptions (Just x) bi = bi { ccOptions = ("-DRUBY" ++ take 2 x) : ccOptions bi }
         addOptions Nothing bi = bi
         parseFlags' bi fl = addOptions (stripPrefix "--rubyversion=" fl) $ case (stripPrefix "--rubylib=" fl, stripPrefix "--rubyinc=" fl) of
-                                        (Just l, _)    -> bi { extraLibs   = l : extraLibs bi }
+                                        (Just l, _)    -> bi { extraLibs   = l : filter (/= "ruby") (extraLibs bi) }
                                         (_, Just l)    -> bi { includeDirs = l : includeDirs bi }
                                         _              -> bi
 
diff --git a/hruby.cabal b/hruby.cabal
--- a/hruby.cabal
+++ b/hruby.cabal
@@ -2,7 +2,7 @@
 --  see http://haskell.org/cabal/users-guide/
 
 name:                hruby
-version:             0.3.1.1
+version:             0.3.1.2
 synopsis:            Embed a Ruby intepreter in your Haskell program !
 description:         This doesn't work with Ruby 1.9. Everything you need should be in Foreign.Ruby.Safe.
 license:             BSD3
@@ -37,6 +37,8 @@
   c-sources:            cbits/shim.c
   install-includes:     cbits/shim.h
   include-dirs:         cbits
+  Includes:             "ruby.h"
+  extra-libraries:      ruby
 
 Test-Suite test-roundtrip
   hs-source-dirs: test