diff --git a/Yesod/Helpers/Auth.hs b/Yesod/Helpers/Auth.hs
--- a/Yesod/Helpers/Auth.hs
+++ b/Yesod/Helpers/Auth.hs
@@ -3,6 +3,7 @@
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Helpers.Auth
     ( -- * Subsite
       Auth
@@ -73,11 +74,17 @@
 
 mkYesodSub "Auth"
     [ ClassP ''YesodAuth [VarT $ mkName "master"]
-    ] [$parseRoutes|
+    ]
+#define STRINGS *Strings
+#if GHC7
+    [parseRoutes|
+#else
+    [$parseRoutes|
+#endif
 /check                 CheckR      GET
 /login                 LoginR      GET
 /logout                LogoutR     GET POST
-/page/#String/*Strings PluginR
+/page/#String/STRINGS PluginR
 |]
 
 credsKey :: String
@@ -94,7 +101,13 @@
                 then do
                     case authRoute y of
                         Nothing -> do
-                            rh <- defaultLayout [$hamlet|%h1 Invalid login|]
+                            rh <- defaultLayout
+#if GHC7
+                                [hamlet|
+#else
+                                [$hamlet|
+#endif
+                                %h1 Invalid login|]
                             sendResponse rh
                         Just ar -> do
                             setMessage $ string "Invalid login"
@@ -115,7 +128,12 @@
         setTitle $ string "Authentication Status"
         addHtml $ html creds) (json creds)
   where
-    html creds = [$hamlet|
+    html creds =
+#if GHC7
+        [hamlet|
+#else
+        [$hamlet|
+#endif
 %h1 Authentication Status
 $maybe creds _
     %p Logged in.
diff --git a/Yesod/Helpers/Auth/Dummy.hs b/Yesod/Helpers/Auth/Dummy.hs
--- a/Yesod/Helpers/Auth/Dummy.hs
+++ b/Yesod/Helpers/Auth/Dummy.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE CPP #-}
 -- | Provides a dummy authentication module that simply lets a user specify
 -- his/her identifier. This is not intended for real world use, just for
 -- testing.
@@ -18,7 +19,12 @@
         setCreds True $ Creds "dummy" ident []
     dispatch _ _ = notFound
     url = PluginR "dummy" []
-    login authToMaster = [$hamlet|
+    login authToMaster =
+#if GHC7
+        [hamlet|
+#else
+        [$hamlet|
+#endif
 %form!method=post!action=@authToMaster.url@
     Your new identifier is: $
     %input!type=text!name=ident
diff --git a/Yesod/Helpers/Auth/Email.hs b/Yesod/Helpers/Auth/Email.hs
--- a/Yesod/Helpers/Auth/Email.hs
+++ b/Yesod/Helpers/Auth/Email.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE QuasiQuotes, TypeFamilies #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Helpers.Auth.Email
     ( authEmail
     , YesodAuthEmail (..)
@@ -62,22 +63,12 @@
 
 authEmail :: YesodAuthEmail m => AuthPlugin m
 authEmail =
-    AuthPlugin "email" dispatch login'
-  where
-    go x = x >>= sendResponse
-    dispatch "GET" ["register"] = go getRegisterR
-    dispatch "POST" ["register"] = go postRegisterR
-    dispatch "GET" ["verify", eid, verkey] = do
-        y <- getYesod
-        case readAuthEmailId y eid of
-            Nothing -> notFound
-            Just eid' -> go $ getVerifyR eid' verkey
-    dispatch "POST" ["login"] = go postLoginR
-    dispatch "GET" ["set-password"] = go getPasswordR
-    dispatch "POST" ["set-password"] = go postPasswordR
-    dispatch _ _ = notFound
-
-    login' tm = [$hamlet|
+    AuthPlugin "email" dispatch $ \tm ->
+#if GHC7
+        [hamlet|
+#else
+        [$hamlet|
+#endif
 %form!method=post!action=@tm.login@
     %table
         %tr
@@ -93,13 +84,30 @@
                 %input!type=submit!value="Login via email"
                 %a!href=@tm.register@ I don't have an account
 |]
+  where
+    dispatch "GET" ["register"] = getRegisterR >>= sendResponse
+    dispatch "POST" ["register"] = postRegisterR >>= sendResponse
+    dispatch "GET" ["verify", eid, verkey] = do
+        y <- getYesod
+        case readAuthEmailId y eid of
+            Nothing -> notFound
+            Just eid' -> getVerifyR eid' verkey >>= sendResponse
+    dispatch "POST" ["login"] = postLoginR >>= sendResponse
+    dispatch "GET" ["set-password"] = getPasswordR >>= sendResponse
+    dispatch "POST" ["set-password"] = postPasswordR >>= sendResponse
+    dispatch _ _ = notFound
 
 getRegisterR :: YesodAuthEmail master => GHandler Auth master RepHtml
 getRegisterR = do
     toMaster <- getRouteToMaster
     defaultLayout $ do
         setTitle $ string "Register a new account"
-        addHamlet [$hamlet|
+        addHamlet
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %p Enter your e-mail address below, and a confirmation e-mail will be sent to you.
 %form!method=post!action=@toMaster.register@
     %label!for=email E-mail
@@ -129,7 +137,12 @@
     sendVerifyEmail email verKey verUrl
     defaultLayout $ do
         setTitle $ string "Confirmation e-mail sent"
-        addWidget [$hamlet|
+        addWidget
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %p A confirmation e-mail has been sent to $email$.
 |]
 
@@ -151,7 +164,12 @@
         _ -> return ()
     defaultLayout $ do
         setTitle $ string "Invalid verification key"
-        addHtml [$hamlet|
+        addHtml
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %p I'm sorry, but that was an invalid verification key.
 |]
 
@@ -191,7 +209,12 @@
             redirect RedirectTemporary $ toMaster login
     defaultLayout $ do
         setTitle $ string "Set password"
-        addHamlet [$hamlet|
+        addHamlet
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %h3 Set a new password
 %form!method=post!action=@toMaster.setpass@
     %table
diff --git a/Yesod/Helpers/Auth/Facebook.hs b/Yesod/Helpers/Auth/Facebook.hs
--- a/Yesod/Helpers/Auth/Facebook.hs
+++ b/Yesod/Helpers/Auth/Facebook.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Helpers.Auth.Facebook
     ( authFacebook
     , facebookUrl
@@ -53,7 +54,12 @@
         render <- liftHandler getUrlRender
         let fb = Facebook.Facebook cid secret $ render $ tm url
         let furl = Facebook.getForwardUrl fb $ perms
-        addHtml [$hamlet|
+        addHtml
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %p
     %a!href=$furl$ Login with Facebook
 |]
diff --git a/Yesod/Helpers/Auth/OpenId.hs b/Yesod/Helpers/Auth/OpenId.hs
--- a/Yesod/Helpers/Auth/OpenId.hs
+++ b/Yesod/Helpers/Auth/OpenId.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Helpers.Auth.OpenId
     ( authOpenId
     , forwardUrl
@@ -20,12 +21,22 @@
     name = "openid_identifier"
     login tm = do
         ident <- newIdent
-        addCassius [$cassius|
-#$ident$
+        addCassius
+#if GHC7
+            [cassius|
+#else
+            [$cassius|
+#endif
+  #$ident$
     background: #fff url(http://www.myopenid.com/static/openid-icon-small.gif) no-repeat scroll 0pt 50%;
     padding-left: 18px;
 |]
-        addHamlet [$hamlet|
+        addHamlet
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %form!method=get!action=@tm.forwardUrl@
     %label!for=openid OpenID: $
     %input#$ident$!type=text!name=$name$!value="http://"
diff --git a/Yesod/Helpers/Auth/Rpxnow.hs b/Yesod/Helpers/Auth/Rpxnow.hs
--- a/Yesod/Helpers/Auth/Rpxnow.hs
+++ b/Yesod/Helpers/Auth/Rpxnow.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Helpers.Auth.Rpxnow
     ( authRpxnow
     ) where
@@ -17,7 +18,12 @@
   where
     login tm = do
         let url = {- FIXME urlEncode $ -} tm $ PluginR "rpxnow" []
-        addHamlet [$hamlet|
+        addHamlet
+#if GHC7
+            [hamlet|
+#else
+            [$hamlet|
+#endif
 %iframe!src="http://$app$.rpxnow.com/openid/embed?token_url=@url@"!scrolling=no!frameBorder=no!allowtransparency=true!style="width:400px;height:240px"
 |]
     dispatch _ [] = do
diff --git a/yesod-auth.cabal b/yesod-auth.cabal
--- a/yesod-auth.cabal
+++ b/yesod-auth.cabal
@@ -1,5 +1,5 @@
 name:            yesod-auth
-version:         0.2.0.1
+version:         0.2.0.2
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -11,9 +11,15 @@
 build-type:      Simple
 homepage:        http://docs.yesodweb.com/
 
+flag ghc7
+
 library
-    build-depends:   base                    >= 4         && < 5
-                   , authenticate            >= 0.7       && < 0.8
+    if flag(ghc7)
+        build-depends:   base                      >= 4.3      && < 5
+        cpp-options:     -DGHC7
+    else
+        build-depends:   base                      >= 4        && < 4.3
+    build-depends:   authenticate            >= 0.7       && < 0.8
                    , bytestring              >= 0.9.1.4   && < 0.10
                    , yesod                   >= 0.6       && < 0.7
                    , wai                     >= 0.2       && < 0.3