diff --git a/autobuild.xml b/autobuild.xml
index 7686b48cf5cd176e30cb16d0fa4742846af25ee3..53a2e59b29c6e54c6ff39a5d95ef0d76f4874d56 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -1351,30 +1351,6 @@
           </map>
         </map>
       </map>
-      <key>pth</key>
-      <map>
-        <key>license</key>
-        <string>lgpl</string>
-        <key>license_file</key>
-        <string>LICENSES/pth.txt</string>
-        <key>name</key>
-        <string>pth</string>
-        <key>platforms</key>
-        <map>
-          <key>darwin</key>
-          <map>
-            <key>archive</key>
-            <map>
-              <key>hash</key>
-              <string>2172379794217d0ffba0db09b2ac17bf</string>
-              <key>url</key>
-              <string>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-darwin-20110303.tar.bz2</string>
-            </map>
-            <key>name</key>
-            <string>darwin</string>
-          </map>
-        </map>
-      </map>
       <key>quicktime</key>
       <map>
         <key>license</key>
diff --git a/indra/cmake/Pth.cmake b/indra/cmake/Pth.cmake
deleted file mode 100644
index a28f6ec696efdbbcaeb8c1ee34dfb7dd7d436421..0000000000000000000000000000000000000000
--- a/indra/cmake/Pth.cmake
+++ /dev/null
@@ -1,21 +0,0 @@
-# -*- cmake -*-
-include(Prebuilt)
-
-set(PTH_FIND_QUIETLY ON)
-set(PTH_FIND_REQUIRED ON)
-
-if (STANDALONE)
-#  ?? How would I construct FindPTH.cmake? This file was cloned from
-#  CURL.cmake, which uses include(FindCURL), but there's no FindCURL.cmake?
-#  include(FindPTH)
-else (STANDALONE)
-  # This library is only needed to support Boost.Coroutine, and only on Mac.
-  if (DARWIN)
-    use_prebuilt_binary(pth)
-    set(PTH_LIBRARIES pth)
-    set(PTH_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include)
-  else (DARWIN)
-    set(PTH_LIBRARIES)
-    set(PTH_INCLUDE_DIRS)
-  endif (DARWIN)
-endif (STANDALONE)
diff --git a/indra/llcommon/CMakeLists.txt b/indra/llcommon/CMakeLists.txt
index 800bf8eba9f9371d7e2adb512ad490327a71dc45..2963fa15afb6716d805442453c6f580c524709ea 100644
--- a/indra/llcommon/CMakeLists.txt
+++ b/indra/llcommon/CMakeLists.txt
@@ -7,7 +7,6 @@ include(00-Common)
 include(LLCommon)
 include(Linking)
 include(Boost)
-include(Pth)
 include(LLSharedLibs)
 include(GoogleBreakpad)
 include(GooglePerfTools)
@@ -18,7 +17,6 @@ include_directories(
     ${EXPAT_INCLUDE_DIRS}
     ${LLCOMMON_INCLUDE_DIRS}
     ${ZLIB_INCLUDE_DIRS}
-    ${PTH_INCLUDE_DIRS}
     )
 
 # add_executable(lltreeiterators lltreeiterators.cpp)
@@ -287,7 +285,6 @@ target_link_libraries(
     ${WINDOWS_LIBRARIES}
     ${BOOST_PROGRAM_OPTIONS_LIBRARY}
     ${BOOST_REGEX_LIBRARY}
-    ${PTH_LIBRARIES}
     ${GOOGLE_PERFTOOLS_LIBRARIES}
     )
 
diff --git a/indra/newview/licenses-mac.txt b/indra/newview/licenses-mac.txt
index 1324fa1a864edcc275b9e10e0d4c9241f1993685..af80bff5d954de09e148cdc9b297990ed6ee8f56 100644
--- a/indra/newview/licenses-mac.txt
+++ b/indra/newview/licenses-mac.txt
@@ -315,516 +315,6 @@ This product includes cryptographic software written by Eric Young
 Hudson (tjh@cryptsoft.com).
 
 
-===========
-Pth License
-===========
-   ____  _   _
-  |  _ \| |_| |__               ``Ian Fleming was a UNIX fan!
-  | |_) | __| '_ \                How do I know? Well, James Bond
-  |  __/| |_| | | |               had the (license to kill) number 007,
-  |_|    \__|_| |_|               i.e., he could execute anyone!''
-
-  GNU Pth - The GNU Portable Threads
-
-  LICENSE
-  =======
-
-  This library is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License as
-  published by the Free Software Foundation; either version 2.1 of the
-  License, or (at your option) any later version.
-
-  For some people, it is not clear, what is the real intention of the
-  author by using the GNU Lesser General Public License (LGPL) as the
-  distribution license for GNU Pth. This is, because the LGPL and the
-  GPL can be (and are often) interpreted very differently and some
-  interpretations seem to be not compatible with others. So an explicit
-  clarification for the use of the LGPL for GNU Pth from the authors
-  point of view might be useful.
-
-  The author places this library under the LGPL to make sure that it
-  can be used both commercially and non-commercially provided that
-  modifications to the code base are always donated back to the official
-  code base under the same license conditions. Please keep in mind that
-  especially using this library in code not staying under the GPL or
-  the LGPL _is_ allowed and that any taint or license creap into code
-  that uses the library is not the authors intention. It is just the
-  case that _including_ this library into the source tree of other
-  applications is a little bit more inconvinient because of the LGPL.
-  But it has to be this way for good reasons. And keep in mind that
-  inconvinient doesn't mean not allowed or even impossible.
-
-  Even if you want to use this library in some BSD-style licensed
-  packages, this _is_ possible as long as you are a little bit
-  carefully. Usually this means you have to make sure that the code is
-  still clearly separated into the source tree and that modifications to
-  this source area are done under the conditions of the LGPL. Read below
-  for more details on the conditions. Contact the author if you have
-  more questions.
-
-  The license text of the GNU Lesser General Public License follows:
-  __________________________________________________________________________
-
-                  GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 2.1, February 1999
-
- Copyright (C) 1991, 1999 Free Software Foundation, Inc.
-     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-[This is the first released version of the Lesser GPL.  It also counts
- as the successor of the GNU Library Public License, version 2, hence
- the version number 2.1.]
-
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-
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-freedom to share and change it.  By contrast, the GNU General Public
-Licenses are intended to guarantee your freedom to share and change
-free software--to make sure the software is free for all its users.
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-specially designated software packages--typically libraries--of the
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-can use it too, but we suggest you first think carefully about whether
-this license or the ordinary General Public License is the better
-strategy to use in any particular case, based on the explanations below.
-
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-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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-THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
-WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
-AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
-FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
-CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
-LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
-RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
-FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
-SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
-DAMAGES.
-
-                     END OF TERMS AND CONDITIONS
-
-
 =======================
 Original SSLeay License
 =======================
diff --git a/indra/newview/skins/default/xui/en/floater_about.xml b/indra/newview/skins/default/xui/en/floater_about.xml
index f5365be11f50a4552b2f8bc4177359578f3948ea..6a1a6006964226bfec43b0ef8292958e7b060bef 100644
--- a/indra/newview/skins/default/xui/en/floater_about.xml
+++ b/indra/newview/skins/default/xui/en/floater_about.xml
@@ -150,7 +150,6 @@ jpeg2000 Copyright (C) 2001, David Taubman, The University of New South Wales (U
 jpeglib Copyright (C) 1991-1998, Thomas G. Lane.
 ogg/vorbis Copyright (C) 2001, Xiphophorus
 OpenSSL Copyright (C) 1998-2002 The OpenSSL Project.
-Pth Copyright (C) 1999-2006 Ralf S. Engelschall &lt;rse@gnu.org&gt;
 SDL Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
 SSLeay Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 xmlrpc-epi Copyright (C) 2000 Epinions, Inc.
diff --git a/indra/viewer_components/login/CMakeLists.txt b/indra/viewer_components/login/CMakeLists.txt
index fe64926da6c9cc03f47fe732788607ac83cc5f97..7720619df3017a718a3ba393f086fbb67d8db768 100644
--- a/indra/viewer_components/login/CMakeLists.txt
+++ b/indra/viewer_components/login/CMakeLists.txt
@@ -9,13 +9,11 @@ endif(LL_TESTS)
 include(LLCommon)
 include(LLMath)
 include(LLXML)
-include(Pth)
 
 include_directories(
     ${LLCOMMON_INCLUDE_DIRS}
     ${LLMATH_INCLUDE_DIRS}
     ${LLXML_INCLUDE_DIRS}
-    ${PTH_INCLUDE_DIRS}
     )
 
 set(login_SOURCE_FILES
@@ -42,7 +40,6 @@ target_link_libraries(lllogin
     ${LLCOMMON_LIBRARIES}
     ${LLMATH_LIBRARIES}
     ${LLXML_LIBRARIES}
-    ${PTH_LIBRARIES}
     )
 
 if(LL_TESTS)
@@ -50,11 +47,5 @@ if(LL_TESTS)
       lllogin.cpp
       )
 
-  set_source_files_properties(
-    lllogin.cpp
-    PROPERTIES
-      LL_TEST_ADDITIONAL_LIBRARIES "${PTH_LIBRARIES}"
-    )
-
   LL_ADD_PROJECT_UNIT_TESTS(lllogin "${lllogin_TEST_SOURCE_FILES}")
 endif(LL_TESTS)
diff --git a/install.xml b/install.xml
index 9658a4195a52198ec12a7a133961eb8ab1ad3004..889386b336c1a658b38dd4ee7b2a47ea0aaae3c0 100644
--- a/install.xml
+++ b/install.xml
@@ -1252,53 +1252,6 @@ anguage Infrstructure (CLI) international standard</string>
           </map>
         </map>
       </map>
-      <key>pth</key>
-      <map>
-        <key>copyright</key>
-        <string>Copyright (c) 1999-2006 Ralf S. Engelschall &lt;rse@gnu.org&gt;</string>
-        <key>description</key>
-        <string>Portable cooperative threads package, used to support Boost.Coroutine on Mac OS X 10.4</string>
-        <key>license</key>
-        <string>lgpl</string>
-        <key>packages</key>
-        <map>
-          <key>darwin</key>
-          <map>
-            <key>md5sum</key>
-            <string>216cb6217a06c64dfae30a55ab8b975c</string>
-            <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-darwin-20090923.tar.bz2</uri>
-          </map>
-          <key>linux</key>
-          <map>
-            <key>md5sum</key>
-            <string>c5c2f73847c126e679d925beab48c7d4</string>
-            <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-linux-20090427.tar.bz2</uri>
-          </map>
-          <key>linux32</key>
-          <map>
-            <key>md5sum</key>
-            <string>c5c2f73847c126e679d925beab48c7d4</string>
-            <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-linux32-20090427.tar.bz2</uri>
-          </map>
-          <key>linux64</key>
-          <map>
-            <key>md5sum</key>
-            <string>c5c2f73847c126e679d925beab48c7d4</string>
-            <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-linux64-20090427.tar.bz2</uri>
-          </map>
-          <key>windows</key>
-          <map>
-            <key>md5sum</key>
-            <string>c5c2f73847c126e679d925beab48c7d4</string>
-            <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/pth-2.0.7-windows-20090427.tar.bz2</uri>
-          </map>
-        </map>
-      </map>
       <key>pulseaudio</key>
       <map>
         <key>copyright</key>