Far-right politician Geert Wilders, who won the elections in the Netherlands, announced that political parties finally reached an agreement to form a coalition government after six months, though he did not identify who would be the prime minister.

"We have a negotiators' agreement," said Wilders, who had reluctantly agreed to give up his dream of running the European Union's fifth-largest economy amid widespread unease over his anti-Islam, anti-European views.

It was not immediately clear who would be the prime minister to lead the right-wing coalition government and replace Mark Rutte, who is almost certain to be tapped as the new NATO secretary general.

"Discussions over the prime minister will be held at a later time," Wilders told reporters.

However, the main contender looks to be former education and interior minister Ronald Plasterk, who also played a key role in overseeing the initial talks.

The parties now have to take the agreement back to their MPs for further discussions. The details of the deal were not immediately available.

In March, the four parties agreed to aim for a partially technocratic government made up of 50 percent politicians and 50 percent from outside politics.

The last time the Netherlands had such an "expert" government was in 1918 and it is not clear how it will work more than 100 years later.

After marathon talks on Tuesday, Wilders said it would be a "historic day" if his far-right PVV Freedom Party took part in a Dutch government for the first time.

The far-right has gained in elections across Europe but has struggled to translate votes into power as other parties refuse to work with them.

'A bit longer'

Wilders, sometimes nicknamed the "Dutch Trump," has softened some of his policy positions but his election manifesto still called for a ban on the Quran and mosques.

After winning the largest share of the vote in the elections, Wilders was primed to be the country's first far-right PM but at least one of his coalition partners threatened to torpedo a deal in that case.

"Do not forget: I will become prime minister of the Netherlands one day. With the support of even more Dutch," Wilders said after reluctantly stepping aside.

"If not tomorrow, then the day after tomorrow. Because the voices of millions of Dutch will be heard."

The coalition talks – between Wilders' PVV, farmers party BBB, the liberal VVD and the new anti-corruption party NSC – have been fractious, not helped by social media sniping from all sides.

In February, NSC head Pieter Omtzigt abruptly stormed out of the talks, ostensibly over disagreements over public finances but he was also known to have major concerns about Wilders' more extreme policies.

Asked why it had taken nearly six months to form a government, Omtzigt smiled and said: "Well, it's a bit the story of the forming of this government."

"Every phase took just a bit longer than we thought, but that's normal."

It has become something of a tradition for Dutch governments to take a long time to form.

The last Rutte government took 271 days to take shape.