No need for DontHave anymore.

libethcore/Common.h

@@ -127,7 +127,6 @@ struct ImportRequirements
 	enum
 	{
 		ValidSeal = 1, ///< Validate seal
-		DontHave = 2, ///< Avoid old blocks
 		UncleBasic = 4, ///< Check the basic structure of the uncles.
 		TransactionBasic = 8, ///< Check the basic structure of the transactions.
 		UncleSeals = 16, ///< Check the basic structure of the uncles.
@@ -136,9 +135,9 @@ struct ImportRequirements
 		UncleParent = 128, ///< Check uncle parent block header.
 		CheckUncles = UncleBasic | UncleSeals, ///< Check uncle seals.
 		CheckTransactions = TransactionBasic | TransactionSignatures, ///< Check transaction signatures.
-		OutOfOrderChecks = ValidSeal | DontHave | CheckUncles | CheckTransactions, ///< Do all checks that can be done independently of prior blocks having been imported.
+		OutOfOrderChecks = ValidSeal | CheckUncles | CheckTransactions, ///< Do all checks that can be done independently of prior blocks having been imported.
 		InOrderChecks = Parent | UncleParent, ///< Do all checks that cannot be done independently of prior blocks having been imported.
-		Everything = ValidSeal | DontHave | CheckUncles | CheckTransactions | Parent | UncleParent,
+		Everything = ValidSeal | CheckUncles | CheckTransactions | Parent | UncleParent,
 		None = 0
 	};
 };

libethereum/BlockChain.cpp

@@ -761,7 +761,7 @@ ImportRoute BlockChain::import(VerifiedBlockRef const& _block, OverlayDB const&
 	try
 	{
 		State canary(_db, BaseState::Empty);
-		canary.populateFromChain(*this, _block.info.hash(), ImportRequirements::DontHave);
+		canary.populateFromChain(*this, _block.info.hash());
 	}
 	catch (...)
 	{