Fix package flags.

bucks.cabal

@@ -10,6 +10,10 @@ maintainer:         nick@typeable.io
 category:           Data
 build-type:         Simple
 
+source-repository:  head
+  type: git
+  location: https://github.com/typeable/bucks.git
+
 flag aeson
      description:     Enable Aeson instances
      default:         False
@@ -33,9 +37,11 @@ library
     if flag(aeson)
        other-modules: Data.Money.JSON
        build-depends: aeson >= 2.0 && < 3.0
+       ghc-options:   -DUSE_AESON
     if flag(rel8)
        other-modules: Data.Money.Rel8
        build-depends: rel8 >= 1.4,
                       scientific
+       ghc-options:   -DUSE_REL8
     hs-source-dirs:   src
     default-language: Haskell2010

src/Data/Money.hs

@@ -1,11 +1,12 @@
 {-# LANGUAGE CPP #-}
 module Data.Money (module Export) where
 
+import Data.Money.Currencies as Export
 import Data.Money.Internal as Export
 
-#ifdef flag_AESON
+#ifdef USE_AESON
 import Data.Money.JSON as Export ()
 #endif
-#ifdef flag_REL8
+#ifdef USE_REL8
 import Data.Money.Rel8 as Export ()
 #endif