installing: require cabal 1.6 or greater, set source-repository url

hledger-lib/hledger-lib.cabal

@@ -14,7 +14,7 @@ homepage:       http://hledger.org
 bug-reports:    http://code.google.com/p/hledger/issues
 stability:      experimental
 tested-with:    GHC==6.10
-cabal-version:  >= 1.2
+cabal-version:  >= 1.6
 build-type:     Simple
 -- data-dir:       
 -- data-files:
@@ -60,13 +60,9 @@ library
                  ,utf8-string >= 0.3
                  ,HUnit
 
--- source-repository head
---   type:     darcs
---   location: http://joyful.com/repos/hledger
--- disabled for now due to:
--- The 'source-repository' section is new in Cabal-1.6. Unfortunately it messes
--- up the parser in earlier Cabal versions so you need to specify 'cabal-version:
--- >= 1.6'.
+source-repository head
+  type:     darcs
+  location: http://joyful.com/repos/hledger
 
 -- cf http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html
 

hledger.cabal

@@ -19,7 +19,7 @@ homepage:       http://hledger.org
 bug-reports:    http://code.google.com/p/hledger/issues
 stability:      experimental
 tested-with:    GHC==6.10, GHC==6.12
-cabal-version:  >= 1.5
+cabal-version:  >= 1.6
 build-type:     Custom
 data-dir:       data
 data-files:
@@ -171,13 +171,9 @@ library
                  ,time
                  ,utf8-string >= 0.3
 
--- source-repository head
---   type:     darcs
---   location: http://joyful.com/repos/hledger
--- disabled for now due to:
--- The 'source-repository' section is new in Cabal-1.6. Unfortunately it messes
--- up the parser in earlier Cabal versions so you need to specify 'cabal-version:
--- >= 1.6'.
+source-repository head
+  type:     darcs
+  location: http://joyful.com/repos/hledger
 
 -- cf http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html