diff --git a/Hack/Frontend/MonadCGI.hs b/Hack/Frontend/MonadCGI.hs
--- a/Hack/Frontend/MonadCGI.hs
+++ b/Hack/Frontend/MonadCGI.hs
@@ -9,6 +9,9 @@
 import qualified Data.Map as Map
 import qualified Data.ByteString.Lazy as BS
 
+import Control.Arrow (first)
+import Data.Char (toUpper)
+
 safeRead :: Read a => a -> String -> a
 safeRead d s = case reads s of
                 ((x, _):_) -> x
@@ -20,7 +23,8 @@
         input = hackInput env
         (inputs, body') = decodeInput vars input
         req = CGIRequest
-                { cgiVars = Map.fromList vars
+                { cgiVars = Map.fromList $ map (first fixVarName) vars
+                                        ++ getCgiVars env
                 , cgiInputs = inputs
                 , cgiRequestBody = body'
                 }
@@ -33,3 +37,20 @@
                     Nothing -> 200
                     Just s -> safeRead 200 s
     return $ Response status' headers' output
+
+fixVarName :: String -> String
+fixVarName = ((++) $ "HTTP_") . map fixVarNameChar
+
+fixVarNameChar :: Char -> Char
+fixVarNameChar '-' = '_'
+fixVarNameChar c = toUpper c
+
+getCgiVars :: Env -> [(String, String)]
+getCgiVars e =
+    [ ("PATH_INFO", pathInfo e)
+    , ("REQUEST_METHOD", show $ requestMethod e)
+    , ("SCRIPT_NAME", scriptName e)
+    , ("QUERY_STRING", queryString e)
+    , ("SERVER_NAME", serverName e)
+    , ("SERVER_PORT", show $ serverPort e)
+    ]
diff --git a/hack-frontend-monadcgi.cabal b/hack-frontend-monadcgi.cabal
--- a/hack-frontend-monadcgi.cabal
+++ b/hack-frontend-monadcgi.cabal
@@ -1,5 +1,5 @@
 name:            hack-frontend-monadcgi
-version:         0.0.0
+version:         0.0.1
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -11,7 +11,10 @@
 build-type:      Simple
 
 library
-    build-depends: base >= 3, bytestring, containers >= 0.2, cgi,
+    build-depends: base >= 4 && < 5,
+                   bytestring,
+                   containers >= 0.2,
+                   cgi,
                    hack >= 2009.5.19
     exposed-modules: Hack.Frontend.MonadCGI
     ghc-options:     -Wall