cabal can now be used to build git-annex.

This is substantially slower than using make, does not build or install
documentation, does not run the test suite, and is not particularly
recommended, but could be useful to some.

configure.hs

@@ -56,12 +56,24 @@ unicodeFilePath = do
 {- Pulls package version out of the changelog. -}
 getVersion :: Test
 getVersion = do
-	changelog <- readFile "debian/changelog"
+	changelog <- readFile "CHANGELOG"
 	let verline = head $ lines changelog
 	let version = middle (words verline !! 1)
+
+	-- Replace Version field in cabal file, so I don't have to maintain
+	-- the version there too.
+	cabal <- readFile cabalfile
+	writeFile tmpcabalfile $ unlines $ map (setversion version) $ lines cabal
+	renameFile tmpcabalfile cabalfile
+
 	return $ Config "packageversion" (StringConfig version)
 	where
 		middle s = drop 1 $ take (length s - 1) s
+		cabalfile = "git-annex.cabal"
+		tmpcabalfile = cabalfile++".tmp"
+		setversion version s
+			| "Version:" `isPrefixOf` s = "Version: " ++ version
+			| otherwise = s
 
 setup :: IO ()
 setup = do