**Exhibit 4.1**

**WARRANT CLARIFICATION AGREEMENT**

This Warrant Clarification Agreement (this“Agreement”), dated November 13, 2006, is to the Warrant Agreement, dated as of December 15, 2005 (the “Warrant Agreement”), by and between Endeavor Acquisition Corporation, a Delaware corporation (“Company”),and Continental Stock Transfer & Trust Company, a New York corporation (“Warrant Agent”). 

**WHEREAS**,Section 3.3.2 of the Warrant Agreement provides that Company shall not be obligated to deliver any securities pursuant to the exercise of a warrant unless a registration statement under the Securities Act of 1933, as amended (“SecuritiesAct”), with respect to the common stock is effective. 

**WHEREAS**, in furtherance of the foregoing, the Company’s finalprospectus, dated December 15, 2005, indicated (i) that no warrant would be exercisable unless at the time of exercise a prospectus relating to the common stock issuable upon exercise of the warrant is current and the common stock has beenregistered under the Securities Act or qualified or deemed to be exempt under the securities laws of the state of residence of the holder of the warrant and (ii) that the warrant may be deprived of any value and the market for the warrant maybe limited if the prospectus relating to the common stock issuable upon the exercise of the warrant is not current or if the common stock is not qualified or exempt from qualification in the jurisdictions in which the holder of the warrant resides.

**WHEREAS**, as a result of certain questions that have arisen regarding the accounting treatment applicable to the warrants, theparties hereto deem it necessary and desirable to amend the Warrant Agreement to clarify that the registered holders do not have the right to receive a net cash settlement in the event the Company does not maintain a current prospectus relating tothe common stock issuable upon exercise of the warrants at the time such warrants are exercisable. 

**NOW, THEREFORE**, in considerationof the mutual agreements contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the parties hereto agree to amend the Warrant Agreement asset forth herein. 

1. Warrant Agreement. The Warrant Agreement is hereby clarified by adding the following sentence as thepenultimate sentence of Section 3.3.2: 

“Accordingly, the Warrants may expire unexercised or unredeemed if thereis no effective registration statement and the Company would have no obligation to pay such registered holder any cash or other consideration or otherwise “net cash settle” the Warrant.” 

2. Miscellaneous. 

(a) GoverningLaw. The validity, interpretation, and performance of this Agreement and of the Warrants shall be governed in all respects by the laws of the State of New York, without giving effect to conflicts of law principles that would result in theapplication of the substantive laws of another jurisdiction. The Company hereby agrees that any action, proceeding or claim against it arising out of or relating in any way to this Agreement shall be brought and enforced in the courts of the Stateof New York or the United States District Court for the Southern District of New York, and irrevocably submits to such 

jurisdiction, which jurisdiction shall be exclusive. The Company hereby waives any objection to such exclusive jurisdiction and that such courts represent aninconvenient forum. Any such process or summons to be served upon the Company may be served by transmitting a copy thereof by registered or certified mail, return receipt requested, postage prepaid, addressed to it at the address set forth inSection 9.2 of the Warrant Agreement. Such mailing shall be deemed personal service and shall be legal and binding upon the Company in any action, proceeding or claim. 

(b) Binding Effect. This Agreement shall be binding upon and inure to the benefit of the parties hereto and to their respective heirs, legalrepresentatives, successors and assigns. 

(c) Entire Agreement. This Agreement sets forth the entire agreement and understandingbetween the parties as to the subject matter thereof and merges and supersedes all prior discussions, agreements and understandings of any and every nature among them. Except as set forth in this Agreement, provisions of the Warrant Agreement whichare not inconsistent with this Agreement shall remain in full force and effect. This Agreement may be executed in counterparts. 

(d)Severability. This Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this Agreement or of any other term or provision hereof.Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as part of this Agreement a provision as similar in terms to such invalid or unenforceable provision as may be possibleand be valid and enforceable. 

IN WITNESS WHEREOF, the parties hereto have executed this Warrant Clarification Agreement as of the datefirst written above. 

 
ENDEAVOR ACQUISTION CORP.By: 
/s/ Jonathan J. Ledecky
 Jonathan J. Ledecky, PresidentCONTINENTAL STOCK TRANSFER & TRUST COMPANYBy: 
/s/ Frank DiPaolo
 Frank DiPaolo