Makefile now builds using cabal, taking advantage of cabal's automatic detection of appropriate build flags.

The only thing lost is ./ghci

Speed: make fast used to take 20 seconds here, when rebuilding from
touching Command/Unused.hs. With cabal, it's 29 seconds.

Utility/SRV.hs

@@ -31,14 +31,12 @@ import Data.Maybe
 import ADNS.Resolver
 import Data.Either
 #else
-#ifndef WITH_HOST
 #ifdef WITH_DNS
 import qualified Network.DNS.Lookup as DNS
 import Network.DNS.Resolver
 import qualified Data.ByteString.UTF8 as B8
 #endif
 #endif
-#endif
 
 newtype SRV = SRV String
 	deriving (Show, Eq)
@@ -64,9 +62,6 @@ lookupSRV (SRV srv) = initResolver [] $ \resolver -> do
 		resolveSRV resolver srv
 	return $ either (\_ -> []) id r
 #else
-#ifdef WITH_HOST
-lookupSRV = lookupSRVHost
-#else
 #ifdef WITH_DNS
 lookupSRV (SRV srv) = do
 	seed <- makeResolvSeed defaultResolvConf
@@ -83,7 +78,6 @@ lookupSRV (SRV srv) = do
 lookupSRV = lookupSRVHost
 #endif
 #endif
-#endif
 
 lookupSRVHost :: SRV -> IO [HostPort]
 lookupSRVHost (SRV srv) = catchDefaultIO [] $