People carrying umbrellas walk by the Ogranization of the Petroleum Exporting Countries (OPEC) headquarters in Vienna, Austria October 4, 2016. OPEC should be able to reach a deal next month to limit oil production without too many exemptions for individual countries and without too much disagreement about output levels, the producer group’s secretary general said on Tuesday. Mohammed Barkindo also told a news conference on the sidelines of the Oil & Money conference that Russia, which is not an OPEC member, was not backtracking on its pledge to contribute to output limits should OPEC reach a deal at its next meeting on Nov. 30. (Reporting by Alex Lawler; Editing by David Goodman)