Document:

Exhibit 4.1

FIFTH SUPPLEMENTAL INDENTURE

THIS FIFTH SUPPLEMENTAL INDENTURE, dated as of May 3,
2007 (this “Fifth Supplemental Indenture”), is
by and among EXCO Resources, Inc., a Texas corporation (the “Issuer”), Southern G
Holdings, LLC, a Delaware limited liability company (the “Guarantor”), and Wilmington
Trust Company, as trustee (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Issuer, the Subsidiary Guarantors (as
defined therein) and the Trustee are parties to an Indenture dated as of
January 20, 2004, as supplemented by the First Supplemental Indenture
dated as of January 27, 2004, the Second Supplemental Indenture dated as of
December 21, 2004, the Third Supplemental Indenture dated as of February 14,
2006 and the Fourth Supplemental Indenture dated as of May 4, 2006
(collectively, the “Indenture”),
providing for the issuance of the Issuer’s 7 1⁄4% Senior Notes Due 2011 (the “Securities”);

WHEREAS, Issuer acquired Guarantor and owns directly
or indirectly all of the equity interests in the Guarantor;

WHEREAS, the Issuer is required to cause the Guarantor
to execute and deliver to the Trustee a supplemental indenture pursuant to
which such Guarantor shall unconditionally and irrevocably guarantee the Issuer’s
obligations with respect to the Securities on the terms set forth in the
Indenture; and

WHEREAS, pursuant to Section 9.01 of the
Indenture, the Issuer and the Trustee are authorized to execute and deliver
this Fifth Supplemental Indenture.

NOW, THEREFORE, for and in consideration of the
foregoing premises, it is mutually covenanted and agreed, for the equal and
proportionate benefit of all Holders of the Securities, as follows:

1.  Capitalized Terms.  Initially capitalized terms used herein
without definition shall have the meanings assigned to them in the Indenture.

2.  Agreement to Become Guarantor.  The Guarantor hereby
unconditionally and irrevocably guarantees the Issuer’s obligations under the
Securities and the Indenture on the terms and subject to the conditions set
forth in Article 10 of the Indenture and agrees to be bound by all other
provisions of the Indenture and the Securities applicable to a “Subsidiary
Guarantor” therein.

3.  Ratification of Indenture; Supplemental Indenture
Part of Indenture.  Except as
expressly amended hereby, the Indenture is in all respects ratified and
confirmed and all the terms, conditions and provisions thereof shall remain in
full force and effect. This Fifth Supplemental Indenture shall form a part
of the Indenture for all purposes, and every holder of Securities heretofore or
hereafter authenticated and delivered shall be bound hereby.

4.  Notices. 
For purposes of Section 14.02 of the Indenture, the address for
notices to the Guarantor shall be:

Southern
G Holdings, LLC

c/o EXCO Resources, Inc.

12377 Merit Drive, Suite 1700

Dallas, TX 75251

5.  Governing Law.  This Fifth Supplemental Indenture shall be
governed by, and construed in accordance with, the laws of the State of New
York.

6.  Counterparts.  The parties may sign any number of copies of
this Fifth Supplemental Indenture. Each signed copy shall be an original, but
all of them together shall represent the same agreement.

7.  Effect of Headings.  The section headings herein are
for convenience only and shall not affect the construction hereof.

8.  The Trustee.  The Trustee shall not be responsible in any
manner whatsoever for or in respect of the validity or sufficiency of this
Fifth Supplemental Indenture or for or in respect of the recitals contained
herein, all of which recitals are made solely by the Issuer and the Guarantor.

 2
 

IN
WITNESS WHEREOF, the parties hereto have caused this Fifth Supplemental
Indenture to be duly executed, all as of the date first above written.

 

	
  

  	
  EXCO RESOURCES,
  INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ J. Douglas
  Ramsey

  	
   

  
	
   

  	
  Name: J. Douglas
  Ramsey

  
	
   

  	
  Title: Vice
  President, CFO and Treasurer

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  SOUTHERN G
  HOLDINGS, LLC, as Guarantor

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ J. Douglas
  Ramsey

  	
   

  
	
   

  	
  Name: J. Douglas
  Ramsey

  
	
   

  	
  Title: Vice
  President

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  WILMINGTON TRUST
  COMPANY, as Trustee

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ W. Thomas
  Morris, II

  	
   

  
	
   

  	
  Name: W. Thomas
  Morris, II

  
	
   

  	
  Title: Assistant
  Vice President

  

 

 3Exhibit
10.1

FIRST
AMENDMENT LETTER AGREEMENT

April 13, 2007

EXCO Resources, Inc.

12377 Merit Drive, Suite 1700

Dallas, Texas 75251

Attention: William L. Boeing

Gentlemen:

Reference
is hereby made to that certain Purchase and Sale Agreement executed on February
1, 2007, and dated effective as of January 1, 2007 (the “Purchase Agreement”),
by and among Anadarko Petroleum Corporation, Anadarko E&P Company LP,
Howell Petroleum Corporation and Kerr-McGee Oil & Gas Onshore LP, as “Seller”,
and EXCO Resources, Inc., as “Purchaser”. Notwithstanding anything contained in
the Purchase Agreement to the contrary, Purchaser shall indemnify, defend, and
hold harmless the Seller Indemnified Persons from and against any and all
Losses, asserted against, resulting from, imposed upon, or incurred or suffered
by any Seller Indemnified Person, directly or indirectly, to the extent
resulting from, arising out of, or relating to any Proceedings for personal
injury or death to any of the individuals identified on Schedule 1 attached
hereto that arises or occurs during the time period beginning on April 16, 2007
and continuing through the Closing Date. In connection therewith, Seller’s
indemnification obligation provided in 11.5(c) shall be subject to and limited
by the foregoing indemnification.

Except
as amended hereby, the Purchase Agreement shall continue in full force and
effect in accordance with its original terms. Any capitalized term used, but
not otherwise defined herein shall have the meaning given to such term in the
Purchase Agreement.

If
Purchaser is in agreement with the foregoing, please execute in the space
provided below.

	
  

  	
  Very truly yours,

  
	
   

  	
   

  
	
   

  	
  ANADARKO
  PETROLEUM CORPORATION

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Albert L. Richey

  
	
   

  	
  Vice President, Corporate Development

  

 

 

	
  

  	
  ANADARKO E&P
  COMPANY LP

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Albert L. Richey

  
	
   

  	
  Vice President, Corporate Development

  
	
   

  	
   

  
	
   

  	
  HOWELL PETROLEUM
  CORPORATION

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Albert L. Richey

  
	
   

  	
  Vice President, Corporate Development

  
	
   

  	
   

  
	
   

  	
  KERR-McGEE OIL
  & GAS ONSHORE LP

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Albert L. Richey

  
	
   

  	
  Vice President, Corporate Development

  
	
   

  	
   

  
	
   

  	
   

  
	
  ACCEPTED AND
  AGREED TO

  THIS 13th DAY OF APRIL, 2007

  EXCO RESOURCES, INC.

  
	
   

  
	
   

  
	
  By:

  	
  /s/ William L.
  Boeing

  	
   

  
	
    William L.
  Boeing

  
	
    Vice
  President, General Counsel & SecretaryExhibit 10.2

SECOND
AMENDMENT TO

PURCHASE AND SALE AGREEMENT

THIS SECOND AMENDMENT TO PURCHASE AND
SALE AGREEMENT (this “Amendment”), effective as of February
1, 2007, is entered into by and among Anadarko Petroleum Corporation, a
Delaware corporation (“APC”), Anadarko E&P Company LP, a Delaware limited
partnership (“AEP”), Howell Petroleum Corporation, a Delaware corporation (“Howell”),
Kerr-McGee Oil & Gas Onshore LP, a Delaware limited partnership (“KMOG”),
Anadarko Gathering Company, a Delaware corporation (“AGC”; APC, AEP, Howell,
KMOG and AGC are collectively called “Seller”) and EXCO Resources, Inc., a
Texas corporation (“Purchaser”).  Each
capitalized term used herein and not otherwise defined herein shall have the
meaning ascribed to it in the Purchase Agreement referred to below.

RECITALS

WHEREAS, APC, AEP, Howell, KMOG and Purchaser entered
into that certain Purchase and Sale Agreement (as amended, the “Purchase
Agreement”), dated February 1, 2007, whereby APC, AEP, Howell and KMOG agreed
to sell, and Purchaser, among other things, agreed to purchase, accept and pay
for the Assets and to assume the Assumed Seller Obligations;

WHEREAS, AGC is a wholly-owned subsidiary of APC; and

WHEREAS, APC, AEP, Howell, KMOG and Purchaser desire
to amend further the Purchase Agreement, among other things, (i) to amend Schedule 1.2(d), and (ii) to include AGC as a “Seller” for
the sole and exclusive purpose of including in the Assets, and selling,
transferring and conveying to Purchaser, all of AGC’s right, title and interest
in and to the Norge Marchand Gas Gathering System that is the subject of the
agreement described in Section 1.3 of this Amendment (the “System”).

NOW, THEREFORE, in consideration of the foregoing and
the mutual promises, covenants, conditions and agreements herein and in the
Purchase Agreement, and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto, intending
to be legally bound by the terms hereof, agree as follows:

ARTICLE
I

AMENDMENTS

Section 1.1             Acknowledgments
and Agreements.  APC, AEP, Howell,
KMOG, AGC and Purchaser agree that AGC is a “Seller” in the Purchase Agreement for
the sole and exclusive purpose of including in the Assets, and selling,
transferring and conveying to Purchaser, all of AGC’s right, title and interest
in and to the System.  At the Closing,
and upon the terms and subject to the conditions of the Purchase Agreement, AGC
agrees to sell, transfer and convey all of AGC’s right, title, interest and
estate, real or personal, recorded or unrecorded, movable or immovable,
tangible or intangible, in and to the System. 

 1
 

Section 1.2             Amendment
to the Definitions Section of the Purchase Agreement.  The Definitions section of the Purchase
Agreement is hereby amended by adding the following defined terms thereto:

“AGC” means Anadarko
Gathering Company, a Delaware corporation and wholly-owned subsidiary of Purchaser.

Section 1.3             Amendment of Schedule 1.2(d) to the Purchase Agreement.  Schedule 1.2(d)
to the Purchase Agreement is hereby amended to include the following:

Agreement for the
Construction, Ownership and Operation of the Norge Marchand Gas Gathering
System dated June 1, 2003, by and among Anadarko Gathering Company and other
working interest owners reflected therein.

ARTICLE
II

MISCELLANEOUS

Section 2.1             Severability.  If any term or other provisions of this
Amendment is held invalid, illegal or incapable of being enforced under any
rule of Law, all other conditions and provisions of this Amendment shall nevertheless
remain in full force and effect so long as the economic or legal substance of
the transactions contemplated hereby is not affected in a materially adverse
manner with respect to either party; provided, however, that if any such term
or provision may be made enforceable by limitation thereof, then such term or
provision shall be deemed to be so limited and shall be enforceable to the
maximum extent permitted by applicable Law

Section 2.2             Governing
Law and Venue.  THIS AMENDMENT AND
THE LEGAL RELATIONS BETWEEN THE PARTIES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS WITHOUT REGARD TO PRINCIPLES OF
CONFLICTS OF LAWS OTHERWISE APPLICABLE TO SUCH DETERMINATIONS.  JURISDICTION AND VENUE WITH RESPECT TO ANY
DISPUTES ARISING HEREUNDER SHALL BE PROPER ONLY IN HARRIS COUNTY, TEXAS.

Section 2.3             Counterparts.
This Amendment may be executed and delivered (including by facsimile
transmission) in counterparts, each of which shall be deemed an original
instrument, but all such counterparts together shall constitute but one
agreement.

Section 2.4             Ratification.  The parties hereto hereby ratify and approve
the Purchase Agreement, as amended hereby, and the parties hereto acknowledge
that all of the terms and provisions of the Purchase Agreement, as amended
hereby, are and remain in full force and effect.

[Signature Page Follows]

 2

IN WITNESS WHEREOF, this Amendment is executed by the
parties hereto as of the date set forth above.

	
  

  	
  ANADARKO
  PETROLEUM CORPORATION

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Name: Albert L.
  Richey

  
	
   

  	
  Title: Vice
  President, Corporate Development

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  ANADARKO
  E&P COMPANY LP

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Name: Albert L.
  Richey

  
	
   

  	
  Title: Vice
  President, Corporate Development

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  HOWELL
  PETROLEUM CORPORATION

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Name: Albert L.
  Richey

  
	
   

  	
  Title: Vice President,
  Corporate Development

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  KERR-MCGEE
  OIL & GAS ONSHORE LP

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Name: Albert L.
  Richey

  
	
   

  	
  Title: Vice
  President

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  ANDARKO
  GATHERING COMPANY

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By: 

  	
  /s/ Albert L.
  Richey

  	
   

  
	
   

  	
  Name: Albert L.
  Richey

  
	
   

  	
  Title: Vice
  President, Corporate Development

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  EXCO
  RESOURCES, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ R. L. Hodges

  	
   

  
	
   

  	
  Name: R. L.
  Hodges

  
	
   

  	
  Title: Vice
  President – Land

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