ISLAMABAD, Pakistan — Pakistan’s major opposition parties joined forces yesterday in drawing up a list of demands for President Musharraf to meet if he wants to avoid a threatened boycott of next month’s elections.

As conditions for their participation in parliamentary elections, the parties are preparing to demand the end of emergency rule and the release of former Supreme Court judges.

The move raises the stakes for Mr. Musharraf’s government, as part of efforts that a former prime minister, Nawaz Sharif, likened to a war to “save Pakistan from further destruction.” Mr. Sharif spent the day campaigning though his candidacy for the January 8 balloting was struck down.

“My resolve to save Pakistan is still high and, God willing, we will win this war against Musharraf,” Mr. Sharif said as he met with supporters at several stops in the mountainous north.

Representatives of Mr. Sharif’s faction and the party of another former prime minister, Benazir Bhutto — normally political foes but drawn together by a common goal of fighting Mr. Musharraf — set up a joint committed to draw up the list of demands and set a deadline for compliance.

“We all were in agreement that under the prevailing, fraudulent system, the forthcoming elections would be massively rigged unless the opposition takes concrete steps,” one of Mr. Sharif’s nominees on the committee, Ahsan Iqbal, said.

This week’s talks between Mr. Sharif and Ms. Bhutto are their first since they both returned from exile.

Mr. Sharif told supporters in Abbottabad their main demand will be that “all the actions in declaring emergency rule should be withdrawn.” He said the committee’s main issue would be how much time to give Mr. Musharraf’s government to accept the demands.

Since he declared emergency rule on November 3, Mr. Musharraf has filled the Supreme Court with loyalists, which quickly approved his continued rule, and jailed hundreds of human rights workers, civic activists, and lawyers.