Changed configurations to make it build with ghc 6.8 and ghc 6.6. I haven't...

Changed configurations to make it build with ghc 6.8 and ghc 6.6. I haven't tested 6.6.1, but it should work.

cabal-install/cabal-install.cabal

@@ -18,6 +18,7 @@ Cabal-Version:      >= 1.2
 
 flag old-base
   description: Old, monolithic base
+  default: False
 
 Executable cabal
     Main-Is:            Main.hs
@@ -39,4 +40,8 @@ Executable cabal
     build-depends: mtl, network, regex-compat, unix, Cabal>=1.3,
                    zlib >= 0.4, HTTP >= 3000.0 && < 3000.1, filepath >= 1.0
 
-    build-depends: base >= 2.1, process, directory, pretty, bytestring >= 0.9
+    if flag(old-base) {
+      build-depends: base == 2.0 || == 2.1.1
+    } else {
+      build-depends: base >= 2.1, process, directory, pretty, bytestring >= 0.9
+    }