The gathering of the 27 national EU leaders was called after Austria and the Netherlands led a growing choir of complaints about increasing arrivals.
In a call ahead of the summit with his Polish, Belgian, Finnish, Maltese and Bulgarian counterparts, Orban called for EU financing for such projects, saying that "fences protect all of Europe", according to his press chief quoted by state news agency MTI.
In a joint letter ahead of the summit, the leaders of Malta, Denmark, Greece, Lithuania, Latvia, Estonia, Austria and Slovakia said the EU's "current asylum system is broken."
"Irregular migration has once again become one of the most pressing issues in the EU," they said.
"Without renewed and successful efforts ... irregular migration to Europe can only be expected to continue and increase in the coming years."