diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e0496c73..627233def 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,27 +71,116 @@ SET(KWSYS_HEADER_ROOT ${CMake_BINARY_DIR}/Source)
 SUBDIRS(Source/kwsys)
 
 #-----------------------------------------------------------------------------
-# Build zlib library for Curl, CMake, and CTest.
-SUBDIRS(Utilities/cmzlib)
-SET(CMAKE_ZLIB_INCLUDES
-  "${CMAKE_CURRENT_BINARY_DIR}/Utilities"
+# Setup third-party libraries.
+
+# Everything in the tree should be able to include files from the
+# Utilities directory.
+INCLUDE_DIRECTORIES(
+  ${CMake_SOURCE_DIR}/Utilities
+  ${CMake_BINARY_DIR}/Utilities
   )
-SET(CMAKE_ZLIB_LIBRARIES "cmzlib")
-SET(CURL_SPECIAL_LIBZ ${CMAKE_ZLIB_LIBRARIES})
-SET(CURL_SPECIAL_LIBZ_INCLUDES ${CMAKE_ZLIB_INCLUDES})
-SET(CURL_SPECIAL_ZLIB_H "cmzlib/zlib.h")
+
+# Third party libraries must be something that can be found.
+IF(EXISTS ${CMAKE_ROOT}/Modules/FindXMLRPC.cmake)
+  SET(CMAKE_ALLOW_SYSTEM_LIBRARIES 1)
+ELSE(EXISTS ${CMAKE_ROOT}/Modules/FindXMLRPC.cmake)
+  SET(CMAKE_ALLOW_SYSTEM_LIBRARIES 0)
+ENDIF(EXISTS ${CMAKE_ROOT}/Modules/FindXMLRPC.cmake)
+
+IF(CMAKE_ALLOW_SYSTEM_LIBRARIES)
+  # Options have dependencies.
+  INCLUDE(CMakeDependentOption)
+
+  # Allow the user to enable/disable all system utility library options
+  # by setting CMAKE_USE_SYSTEM_LIBRARIES on the command line.
+  IF(DEFINED CMAKE_USE_SYSTEM_LIBRARIES)
+    SET(CMAKE_USE_SYSTEM_LIBRARIES_USER 1)
+  ENDIF(DEFINED CMAKE_USE_SYSTEM_LIBRARIES)
+  IF(CMAKE_USE_SYSTEM_LIBRARIES)
+    SET(CMAKE_USE_SYSTEM_LIBRARIES ON)
+  ELSE(CMAKE_USE_SYSTEM_LIBRARIES)
+    SET(CMAKE_USE_SYSTEM_LIBRARIES OFF)
+  ENDIF(CMAKE_USE_SYSTEM_LIBRARIES)
+  IF(CMAKE_USE_SYSTEM_LIBRARIES_USER)
+    SET(CMAKE_USE_SYSTEM_CURL "${CMAKE_USE_SYSTEM_LIBRARIES}" CACHE BOOL "Use system-installed curl" FORCE)
+    SET(CMAKE_USE_SYSTEM_EXPAT "${CMAKE_USE_SYSTEM_LIBRARIES}" CACHE BOOL "Use system-installed expat" FORCE)
+    SET(CMAKE_USE_SYSTEM_XMLRPC "${CMAKE_USE_SYSTEM_LIBRARIES}" CACHE BOOL "Use system-installed xmlrpc" FORCE)
+    SET(CMAKE_USE_SYSTEM_ZLIB "${CMAKE_USE_SYSTEM_LIBRARIES}" CACHE BOOL "Use system-installed zlib" FORCE)
+  ENDIF(CMAKE_USE_SYSTEM_LIBRARIES_USER)
+
+  # Optionally use system utility libraries.
+  OPTION(CMAKE_USE_SYSTEM_CURL   "Use system-installed curl" ${CMAKE_USE_SYSTEM_LIBRARIES})
+  OPTION(CMAKE_USE_SYSTEM_XMLRPC "Use system-installed xmlrpc" ${CMAKE_USE_SYSTEM_LIBRARIES})
+  CMAKE_DEPENDENT_OPTION(CMAKE_USE_SYSTEM_EXPAT "Use system-installed expat"
+    ${CMAKE_USE_SYSTEM_LIBRARIES} "NOT CMAKE_USE_SYSTEM_XMLRPC" ON)
+  CMAKE_DEPENDENT_OPTION(CMAKE_USE_SYSTEM_ZLIB "Use system-installed zlib"
+    ${CMAKE_USE_SYSTEM_LIBRARIES} "NOT CMAKE_USE_SYSTEM_CURL" ON)
+
+  # There is currently no option for system tar because the upstream
+  # libtar does not have our modifications to allow reentrant
+  # object-oriented use of the library.
+  # OPTION(CMAKE_USE_SYSTEM_TAR    "Use system-installed tar"   OFF)
+ELSE(CMAKE_ALLOW_SYSTEM_LIBRARIES)
+  SET(CMAKE_USE_SYSTEM_CURL 0)
+  SET(CMAKE_USE_SYSTEM_EXPAT 0)
+  SET(CMAKE_USE_SYSTEM_XMLRPC 0)
+  SET(CMAKE_USE_SYSTEM_ZLIB 0)
+ENDIF(CMAKE_ALLOW_SYSTEM_LIBRARIES)
+
+# Inform utility library header wrappers whether to use system versions.
+CONFIGURE_FILE(${CMake_SOURCE_DIR}/Utilities/cmThirdParty.h.in
+               ${CMake_BINARY_DIR}/Utilities/cmThirdParty.h
+               @ONLY IMMEDIATE)
+
+# Mention to the user what system libraries are being used.
+FOREACH(util CURL EXPAT XMLRPC ZLIB)
+  IF(CMAKE_USE_SYSTEM_${util})
+    MESSAGE(STATUS "Using system-installed ${util}")
+  ENDIF(CMAKE_USE_SYSTEM_${util})
+ENDFOREACH(util)
+
+#-----------------------------------------------------------------------------
+# Build zlib library for Curl, CMake, and CTest.
+SET(CMAKE_ZLIB_HEADER "cm_zlib.h")
+IF(CMAKE_USE_SYSTEM_ZLIB)
+  FIND_PACKAGE(ZLIB)
+  IF(NOT ZLIB_FOUND)
+    MESSAGE(FATAL_ERROR "CMAKE_USE_SYSTEM_ZLIB is ON but a zlib is not found!")
+  ENDIF(NOT ZLIB_FOUND)
+  SET(CMAKE_ZLIB_INCLUDES ${ZLIB_INCLUDE_DIR})
+  SET(CMAKE_ZLIB_LIBRARIES ${ZLIB_LIBRARIES})
+ELSE(CMAKE_USE_SYSTEM_ZLIB)
+  SUBDIRS(Utilities/cmzlib)
+  SET(CMAKE_ZLIB_INCLUDES)
+  SET(CMAKE_ZLIB_LIBRARIES cmzlib)
+ENDIF(CMAKE_USE_SYSTEM_ZLIB)
 
 #-----------------------------------------------------------------------------
 # Build Curl library for CTest.
-SUBDIRS(Utilities/cmcurl)
-SET(CMAKE_CURL_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/Utilities")
-SET(CMAKE_CURL_LIBRARIES "cmcurl")
+IF(CMAKE_USE_SYSTEM_CURL)
+  FIND_PACKAGE(CURL)
+  IF(NOT CURL_FOUND)
+    MESSAGE(FATAL_ERROR "CMAKE_USE_SYSTEM_CURL is ON but a curl is not found!")
+  ENDIF(NOT CURL_FOUND)
+  SET(CMAKE_CURL_INCLUDES ${CURL_INCLUDE_DIRS})
+  SET(CMAKE_CURL_LIBRARIES ${CURL_LIBRARIES})
+ELSE(CMAKE_USE_SYSTEM_CURL)
+  SET(CURL_SPECIAL_ZLIB_H ${CMAKE_ZLIB_HEADER})
+  SET(CURL_SPECIAL_LIBZ_INCLUDES ${CMAKE_ZLIB_INCLUDES})
+  SET(CURL_SPECIAL_LIBZ ${CMAKE_ZLIB_LIBRARIES})
+  SUBDIRS(Utilities/cmcurl)
+  SET(CMAKE_CURL_INCLUDES)
+  SET(CMAKE_CURL_LIBRARIES cmcurl)
+ENDIF(CMAKE_USE_SYSTEM_CURL)
 
 #-----------------------------------------------------------------------------
 # Build Tar library for CTest.
+SET(CMTAR_ZLIB_HEADER ${CMAKE_ZLIB_HEADER})
+SET(CMTAR_ZLIB_LIBRARIES ${CMAKE_ZLIB_LIBRARIES})
+SET(CMTAR_ZLIB_INCLUDE_DIRS ${CMAKE_ZLIB_INCLUDES})
 SUBDIRS(Utilities/cmtar)
-SET(CMAKE_TAR_INCLUDES "${CMAKE_CURRENT_BINARY_DIR}/Utilities/cmtar")
-SET(CMAKE_TAR_LIBRARIES "cmtar")
+SET(CMAKE_TAR_INCLUDES ${CMAKE_CURRENT_BINARY_DIR}/Utilities/cmtar)
+SET(CMAKE_TAR_LIBRARIES cmtar)
 
 #-----------------------------------------------------------------------------
 # Build Compress library for CTest.
@@ -101,19 +190,33 @@ SET(CMAKE_COMPRESS_LIBRARIES "cmcompress")
 
 #-----------------------------------------------------------------------------
 # Build expat library for CMake and CTest.
-SUBDIRS(Utilities/cmexpat)
-SET(CMAKE_EXPAT_INCLUDES
-  "${CMAKE_CURRENT_BINARY_DIR}/Utilities"
-  "${CMAKE_CURRENT_BINARY_DIR}/Utilities/cmexpat"
-  )
-SET(CMAKE_EXPAT_LIBRARIES "cmexpat")
+IF(CMAKE_USE_SYSTEM_EXPAT)
+  FIND_PACKAGE(EXPAT)
+  IF(NOT EXPAT_FOUND)
+    MESSAGE(FATAL_ERROR
+      "CMAKE_USE_SYSTEM_EXPAT is ON but a expat is not found!")
+  ENDIF(NOT EXPAT_FOUND)
+  SET(CMAKE_EXPAT_INCLUDES ${EXPAT_INCLUDE_DIRS})
+  SET(CMAKE_EXPAT_LIBRARIES ${EXPAT_LIBRARIES})
+ELSE(CMAKE_USE_SYSTEM_EXPAT)
+  SUBDIRS(Utilities/cmexpat)
+  SET(CMAKE_EXPAT_INCLUDES)
+  SET(CMAKE_EXPAT_LIBRARIES cmexpat)
+ENDIF(CMAKE_USE_SYSTEM_EXPAT)
 
-SUBDIRS(Utilities/cmxmlrpc)
-SET(CMAKE_XMLRPC_INCLUDES
-  "${CMAKE_CURRENT_SOURCE_DIR}/Utilities/cmxmlrpc"
-  "${CMAKE_CURRENT_BINARY_DIR}/Utilities/cmxmlrpc"
-  )
-SET(CMAKE_XMLRPC_LIBRARIES "cmXMLRPC")
+IF(CMAKE_USE_SYSTEM_XMLRPC)
+  FIND_PACKAGE(XMLRPC QUIET REQUIRED libwww-client)
+  IF(NOT XMLRPC_FOUND)
+    MESSAGE(FATAL_ERROR
+      "CMAKE_USE_SYSTEM_XMLRPC is ON but a xmlrpc is not found!")
+  ENDIF(NOT XMLRPC_FOUND)
+  SET(CMAKE_XMLRPC_INCLUDES ${XMLRPC_INCLUDE_DIRS})
+  SET(CMAKE_XMLRPC_LIBRARIES ${XMLRPC_LIBRARIES})
+ELSE(CMAKE_USE_SYSTEM_XMLRPC)
+  SUBDIRS(Utilities/cmxmlrpc)
+  SET(CMAKE_XMLRPC_INCLUDES)
+  SET(CMAKE_XMLRPC_LIBRARIES cmXMLRPC)
+ENDIF(CMAKE_USE_SYSTEM_XMLRPC)
 
 IF (UNIX)
   FIND_PACKAGE(Curses QUIET)
diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 17aa18d88..8bd39a175 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -352,6 +352,13 @@ IF(BUILD_TESTING)
     SET(CMAKE_TEST_DIFFERENT_GENERATOR TRUE)
   ENDIF(NOT CMAKE_TEST_GENERATOR)
 
+  SET(CMAKE_TEST_SYSTEM_LIBRARIES 0)
+  FOREACH(util CURL EXPAT XMLRPC ZLIB)
+    IF(CMAKE_USE_SYSTEM_${util})
+      SET(CMAKE_TEST_SYSTEM_LIBRARIES 1)
+    ENDIF(CMAKE_USE_SYSTEM_${util})
+  ENDFOREACH(util)
+
   # This variable is set by cmake, however to
   # test cmake we want to make sure that
   # the ctest from this cmake is used for testing
@@ -602,6 +609,7 @@ IF(BUILD_TESTING)
       --build-exe-dir "${CMake_BINARY_DIR}/Tests/Complex/bin"
       --build-options
       -DCMAKE_TEST_DIFFERENT_GENERATOR:BOOL=${CMAKE_TEST_DIFFERENT_GENERATOR}
+      -DCMAKE_TEST_SYSTEM_LIBRARIES:BOOL=${CMAKE_TEST_SYSTEM_LIBRARIES}
       --test-command complex
       )
 
@@ -615,6 +623,7 @@ IF(BUILD_TESTING)
       --build-exe-dir "${CMake_BINARY_DIR}/Tests/ComplexOneConfig/bin"
       --build-options
       -DCMAKE_TEST_DIFFERENT_GENERATOR:BOOL=${CMAKE_TEST_DIFFERENT_GENERATOR}
+      -DCMAKE_TEST_SYSTEM_LIBRARIES:BOOL=${CMAKE_TEST_SYSTEM_LIBRARIES}
       --test-command complex)
 
 #    ADD_TEST(complexRelativePaths  ${CMAKE_CTEST_COMMAND}
diff --git a/Source/CPack/cmCPackTGZGenerator.cxx b/Source/CPack/cmCPackTGZGenerator.cxx
index d4663db8c..133fe0a22 100644
--- a/Source/CPack/cmCPackTGZGenerator.cxx
+++ b/Source/CPack/cmCPackTGZGenerator.cxx
@@ -26,7 +26,7 @@
 #include "cmCPackLog.h"
 
 #include <cmsys/SystemTools.hxx>
-#include <cmzlib/zutil.h>
+#include <cm_zlib.h>
 #include <libtar/libtar.h>
 #include <memory> // auto_ptr
 #include <fcntl.h>
@@ -94,7 +94,7 @@ int cmCPackTGZ_Data_Open(void *client_data, const char* pathname,
     mydata->ZLibStream.opaque = Z_NULL;
     int strategy = Z_DEFAULT_STRATEGY;
     if ( deflateInit2(&mydata->ZLibStream, mydata->CompressionLevel,
-        Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy) != Z_OK )
+        Z_DEFLATED, -MAX_WBITS, 8, strategy) != Z_OK )
       {
       return -1;
       }
@@ -281,7 +281,8 @@ int cmCPackTGZGenerator::GenerateHeader(std::ostream* os)
     const int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
     char header[11];
     sprintf(header, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
-      Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+            Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/,
+            3 /* zlib os code for UNIX, not really used anyway */);
     os->write(header, 10);
     }
   return 1;
diff --git a/Source/CTest/cmCTestSubmitHandler.cxx b/Source/CTest/cmCTestSubmitHandler.cxx
index b20388c1c..6fd24de11 100644
--- a/Source/CTest/cmCTestSubmitHandler.cxx
+++ b/Source/CTest/cmCTestSubmitHandler.cxx
@@ -25,11 +25,10 @@ PURPOSE.  See the above copyright notices for more information.
 #include <cmsys/Base64.h>
 
 // For XML-RPC submission
-#include "xmlrpc.h"
-#include "xmlrpc_client.h"
+#include "cm_xmlrpc.h"
 
 // For curl submission
-#include "cmcurl/curl/curl.h"
+#include "cm_curl.h"
 
 #include <sys/stat.h>
 
@@ -644,12 +643,14 @@ bool cmCTestSubmitHandler::SubmitUsingXMLRPC(const cmStdString& localprefix,
   const cmStdString& url)
 {
   xmlrpc_env env;
-  std::string ctestVersion = cmVersion::GetCMakeVersion();
+  char ctestString[] = "CTest";
+  std::string ctestVersionString = cmVersion::GetCMakeVersion();
+  char* ctestVersion = const_cast<char*>(ctestVersionString.c_str());
 
   cmStdString realURL = url + "/" + remoteprefix + "/Command/";
 
   /* Start up our XML-RPC client library. */
-  xmlrpc_client_init(XMLRPC_CLIENT_NO_FLAGS, "CTest", ctestVersion.c_str());
+  xmlrpc_client_init(XMLRPC_CLIENT_NO_FLAGS, ctestString, ctestVersion);
 
   /* Initialize our error-handling environment. */
   xmlrpc_env_init(&env);
@@ -697,9 +698,9 @@ bool cmCTestSubmitHandler::SubmitUsingXMLRPC(const cmStdString& localprefix,
       }
     fclose(fp);
 
-    std::string remoteCommand = "Submit.put";
-    result = xmlrpc_client_call(&env, realURL.c_str(),
-      remoteCommand.c_str(),
+    char remoteCommand[] = "Submit.put";
+    char* pRealURL = const_cast<char*>(realURL.c_str());
+    result = xmlrpc_client_call(&env, pRealURL, remoteCommand,
       "(6)", fileBuffer, (xmlrpc_int32)fileSize );
 
     delete [] fileBuffer;
diff --git a/Source/cmCTest.cxx b/Source/cmCTest.cxx
index 8d0576291..653fc12ee 100644
--- a/Source/cmCTest.cxx
+++ b/Source/cmCTest.cxx
@@ -14,7 +14,7 @@
      PURPOSE.  See the above copyright notices for more information.
 
 =========================================================================*/
-#include "cmcurl/curl/curl.h"
+#include "cm_curl.h"
 
 #include "cmCTest.h"
 #include "cmake.h"
diff --git a/Source/cmGeneratedFileStream.cxx b/Source/cmGeneratedFileStream.cxx
index e8be5fdff..82ac2b778 100644
--- a/Source/cmGeneratedFileStream.cxx
+++ b/Source/cmGeneratedFileStream.cxx
@@ -27,7 +27,7 @@
 #endif
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
-# include <cmzlib/zlib.h>
+# include <cm_zlib.h>
 #endif
 
 //----------------------------------------------------------------------------
@@ -213,7 +213,7 @@ void cmGeneratedFileStreamBase::Close()
 int cmGeneratedFileStreamBase::CompressFile(const char* oldname,
                                             const char* newname)
 {
-  gzFile gf = cm_zlib_gzopen(newname, "w");
+  gzFile gf = gzopen(newname, "w");
   if ( !gf )
     {
     return 0;
@@ -228,15 +228,15 @@ int cmGeneratedFileStreamBase::CompressFile(const char* oldname,
   char buffer[BUFFER_SIZE];
   while ( (res = fread(buffer, 1, BUFFER_SIZE, ifs)) > 0 )
     {
-    if ( !cm_zlib_gzwrite(gf, buffer, res) )
+    if ( !gzwrite(gf, buffer, res) )
       {
       fclose(ifs);
-      cm_zlib_gzclose(gf);
+      gzclose(gf);
       return 0;
       }
     }
   fclose(ifs);
-  cm_zlib_gzclose(gf);
+  gzclose(gf);
   return 1;
 }
 #else
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 4d257b206..8746c7aa6 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -48,7 +48,7 @@
 #  include <libtar/libtar.h>
 #  include <memory> // auto_ptr
 #  include <fcntl.h>
-#  include <cmzlib/zlib.h>
+#  include <cm_zlib.h>
 #endif
 
 #if defined(__sgi) && !defined(__GNUC__)
@@ -1439,7 +1439,7 @@ int cmSystemToolsGZStructOpen(void* call_data, const char *pathname,
     }
 #endif
 
-  gzf->GZFile = cm_zlib_gzdopen(fd, gzoflags);
+  gzf->GZFile = gzdopen(fd, gzoflags);
   if (!gzf->GZFile)
   {
     errno = ENOMEM;
@@ -1452,20 +1452,20 @@ int cmSystemToolsGZStructOpen(void* call_data, const char *pathname,
 int cmSystemToolsGZStructClose(void* call_data)
 {
   cmSystemToolsGZStruct* gzf = static_cast<cmSystemToolsGZStruct*>(call_data);
-  return cm_zlib_gzclose(gzf->GZFile);
+  return gzclose(gzf->GZFile);
 }
 
 ssize_t cmSystemToolsGZStructRead(void* call_data, void* buf, size_t count)
 {
   cmSystemToolsGZStruct* gzf = static_cast<cmSystemToolsGZStruct*>(call_data);
-  return cm_zlib_gzread(gzf->GZFile, buf, count);
+  return gzread(gzf->GZFile, buf, count);
 }
 
 ssize_t cmSystemToolsGZStructWrite(void* call_data, const void* buf,
                                    size_t count)
 {
   cmSystemToolsGZStruct* gzf = static_cast<cmSystemToolsGZStruct*>(call_data);
-  return cm_zlib_gzwrite(gzf->GZFile, (void*)buf, count);
+  return gzwrite(gzf->GZFile, (void*)buf, count);
 }
 
 #endif
diff --git a/Source/cmXMLParser.cxx b/Source/cmXMLParser.cxx
index 58f365692..2894090e5 100644
--- a/Source/cmXMLParser.cxx
+++ b/Source/cmXMLParser.cxx
@@ -16,7 +16,7 @@
 =========================================================================*/
 #include "cmXMLParser.h"
 
-#include <cmexpat/expat.h>
+#include <cm_expat.h>
 #include <ctype.h>
 
 //----------------------------------------------------------------------------
diff --git a/Utilities/cmThirdParty.h.in b/Utilities/cmThirdParty.h.in
new file mode 100644
index 000000000..845a1bd5f
--- /dev/null
+++ b/Utilities/cmThirdParty.h.in
@@ -0,0 +1,26 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef __cmThirdParty_h
+#define __cmThirdParty_h
+
+/* Whether CMake is using its own utility libraries.  */
+#cmakedefine CMAKE_USE_SYSTEM_CURL
+#cmakedefine CMAKE_USE_SYSTEM_EXPAT
+#cmakedefine CMAKE_USE_SYSTEM_XMLRPC
+#cmakedefine CMAKE_USE_SYSTEM_ZLIB
+
+#endif
diff --git a/Utilities/cm_curl.h b/Utilities/cm_curl.h
new file mode 100644
index 000000000..0fcb5c514
--- /dev/null
+++ b/Utilities/cm_curl.h
@@ -0,0 +1,28 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef __cm_curl_h
+#define __cm_curl_h
+
+/* Use the curl library configured for CMake.  */
+#include "cmThirdParty.h"
+#ifdef CMAKE_USE_SYSTEM_CURL
+# include <curl/curl.h>
+#else
+# include <cmcurl/curl/curl.h>
+#endif
+
+#endif
diff --git a/Utilities/cm_expat.h b/Utilities/cm_expat.h
new file mode 100644
index 000000000..f152abbb4
--- /dev/null
+++ b/Utilities/cm_expat.h
@@ -0,0 +1,28 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef __cm_expat_h
+#define __cm_expat_h
+
+/* Use the expat library configured for CMake.  */
+#include "cmThirdParty.h"
+#ifdef CMAKE_USE_SYSTEM_EXPAT
+# include <expat.h>
+#else
+# include <cmexpat/expat.h>
+#endif
+
+#endif
diff --git a/Utilities/cm_xmlrpc.h b/Utilities/cm_xmlrpc.h
new file mode 100644
index 000000000..95655bff4
--- /dev/null
+++ b/Utilities/cm_xmlrpc.h
@@ -0,0 +1,30 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef __cm_xmlrpc_h
+#define __cm_xmlrpc_h
+
+/* Use the xmlrpc library configured for CMake.  */
+#include "cmThirdParty.h"
+#ifdef CMAKE_USE_SYSTEM_XMLRPC
+# include <xmlrpc.h>
+# include <xmlrpc_client.h>
+#else
+# include <cmxmlrpc/xmlrpc.h>
+# include <cmxmlrpc/xmlrpc_client.h>
+#endif
+
+#endif
diff --git a/Utilities/cm_zlib.h b/Utilities/cm_zlib.h
new file mode 100644
index 000000000..a5bb52ac1
--- /dev/null
+++ b/Utilities/cm_zlib.h
@@ -0,0 +1,28 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef __cm_zlib_h
+#define __cm_zlib_h
+
+/* Use the zlib library configured for CMake.  */
+#include "cmThirdParty.h"
+#ifdef CMAKE_USE_SYSTEM_ZLIB
+# include <zlib.h>
+#else
+# include <cmzlib/zlib.h>
+#endif
+
+#endif
diff --git a/Utilities/cmtar/CMakeLists.txt b/Utilities/cmtar/CMakeLists.txt
index a54e629cf..4b4ce40fe 100644
--- a/Utilities/cmtar/CMakeLists.txt
+++ b/Utilities/cmtar/CMakeLists.txt
@@ -367,11 +367,18 @@ ENDIF(NOT HAVE_FNMATCH)
 #SET(NEED_GLOB 1)
 #ENDIF(NOT HAVE_GLOB)
 
+# Setup zlib.
+IF(NOT CMTAR_ZLIB_LIBRARIES)
+  MESSAGE(FATAL_ERROR "Parent project must set CMTAR_ZLIB_LIBRARIES.")
+ENDIF(NOT CMTAR_ZLIB_LIBRARIES)
+IF(NOT CMTAR_ZLIB_HEADER)
+  MESSAGE(FATAL_ERROR "Parent project must set CMTAR_ZLIB_HEADER.")
+ENDIF(NOT CMTAR_ZLIB_HEADER)
+INCLUDE_DIRECTORIES(${CMTAR_ZLIB_INCLUDE_DIRS})
 
 CONFIGURE_FILE(${LIBTAR_SOURCE_DIR}/config.h.in
   ${LIBTAR_BINARY_DIR}/libtar/config.h)
 
 ADD_LIBRARY(cmtar STATIC ${libtar_SRC})
 ADD_EXECUTABLE(tartest libtar.c)
-TARGET_LINK_LIBRARIES(tartest cmtar ${CMAKE_ZLIB_LIBRARIES})
-
+TARGET_LINK_LIBRARIES(tartest cmtar ${CMTAR_ZLIB_LIBRARIES})
diff --git a/Utilities/cmtar/config.h.in b/Utilities/cmtar/config.h.in
index 1ab4362e8..b3b7f5ccc 100644
--- a/Utilities/cmtar/config.h.in
+++ b/Utilities/cmtar/config.h.in
@@ -42,9 +42,6 @@
 /* Define to 1 if you have the `z' library (-lz). */
 #cmakedefine HAVE_LIBZ @HAVE_LIBZ@
 
-/* Define to 1 if you have the VTK's `z' library */
-#cmakedefine HAVE_VTK_LIBZ @HAVE_VTK_LIBZ@
-
 /* Define to 1 if the system has the type `major_t'. */
 #cmakedefine HAVE_MAJOR_T @HAVE_MAJOR_T@
 
@@ -209,3 +206,5 @@
 
 /* Define to `long long' if not defined in system header files. */
 #cmakedefine uint64_t @uint64_t@
+
+#define CMTAR_ZLIB_HEADER "@CMTAR_ZLIB_HEADER@"
diff --git a/Utilities/cmtar/libtar.c b/Utilities/cmtar/libtar.c
index c918e24b5..362c105b2 100644
--- a/Utilities/cmtar/libtar.c
+++ b/Utilities/cmtar/libtar.c
@@ -35,18 +35,7 @@
 # include <signal.h>
 #endif
 
-#ifdef HAVE_LIBZ
-#ifdef HAVE_VTK_LIBZ
-# include <vtkzlib/zlib.h>
-# define cm_zlib_gzdopen gzdopen
-# define cm_zlib_gzclose gzclose
-# define cm_zlib_gzread gzread
-# define cm_zlib_gzwrite gzwrite
-
-#else
-# include <cmzlib/zlib.h>
-#endif
-#endif
+#include CMTAR_ZLIB_HEADER
 
 #include <libtar/compat.h>
 
@@ -117,7 +106,7 @@ static int libtar_gzopen(void* call_data, const char *pathname,
     }
 #endif
 
-  gzf->GZFile = cm_zlib_gzdopen(fd, gzoflags);
+  gzf->GZFile = gzdopen(fd, gzoflags);
   if (!gzf->GZFile)
   {
     errno = ENOMEM;
@@ -130,19 +119,19 @@ static int libtar_gzopen(void* call_data, const char *pathname,
 static int libtar_gzclose(void* call_data)
 {
   struct gzStruct* gzf = (struct gzStruct*)call_data;
-  return cm_zlib_gzclose(gzf->GZFile);
+  return gzclose(gzf->GZFile);
 }
 
 static ssize_t libtar_gzread(void* call_data, void* buf, size_t count)
 {
   struct gzStruct* gzf = (struct gzStruct*)call_data;
-  return cm_zlib_gzread(gzf->GZFile, buf, count);
+  return gzread(gzf->GZFile, buf, count);
 }
 
 static ssize_t libtar_gzwrite(void* call_data, const void* buf, size_t count)
 {
   struct gzStruct* gzf = (struct gzStruct*)call_data;
-  return cm_zlib_gzwrite(gzf->GZFile, (void*)buf, count);
+  return gzwrite(gzf->GZFile, (void*)buf, count);
 }
 
 tartype_t gztype = { 
diff --git a/Utilities/cmxmlrpc/xmlrpc.h b/Utilities/cmxmlrpc/xmlrpc.h
index 69160a200..30b83842a 100644
--- a/Utilities/cmxmlrpc/xmlrpc.h
+++ b/Utilities/cmxmlrpc/xmlrpc.h
@@ -29,7 +29,7 @@
 
 #include <stddef.h>
 #include <stdarg.h>
-#include <xmlrpc_config.h>
+#include <cmxmlrpc/xmlrpc_config.h>
 
 #ifdef HAVE_UNICODE_WCHAR
 #include <wchar.h>
@@ -778,7 +778,7 @@ char *xmlrpc_authcookie(void);
    in here.  For backward compatibility, we need to include it here, even
    though it really isn't logical to do so.
 */
-#include <xmlrpc_server.h>
+#include <cmxmlrpc/xmlrpc_server.h>
 
 #endif
 
diff --git a/Utilities/cmxmlrpc/xmlrpc_expat.c b/Utilities/cmxmlrpc/xmlrpc_expat.c
index cb467d17c..d7b6e1980 100644
--- a/Utilities/cmxmlrpc/xmlrpc_expat.c
+++ b/Utilities/cmxmlrpc/xmlrpc_expat.c
@@ -28,7 +28,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
-#include <expat.h>
+#include <cm_expat.h>
 
 #include "xmlrpc.h"
 #include "xmlrpc_int.h"