diff --git a/boost-1.48.0-xtime.patch b/boost-1.48.0-xtime.patch
new file mode 100644
index 0000000..01ad47f
--- /dev/null
+++ b/boost-1.48.0-xtime.patch
@@ -0,0 +1,69 @@
+diff -up boost_1_48_0/boost/thread/xtime.hpp\~ boost_1_48_0/boost/thread/xtime.hpp
+--- boost_1_48_0/boost/thread/xtime.hpp~	2008-06-18 15:01:08.000000000 +0200
++++ boost_1_48_0/boost/thread/xtime.hpp	2012-05-24 20:45:18.000000000 +0200
+@@ -18,18 +18,6 @@
+ 
+ namespace boost {
+ 
+-enum xtime_clock_types
+-{
+-    TIME_UTC=1
+-//    TIME_TAI,
+-//    TIME_MONOTONIC,
+-//    TIME_PROCESS,
+-//    TIME_THREAD,
+-//    TIME_LOCAL,
+-//    TIME_SYNC,
+-//    TIME_RESOLUTION
+-};
+-
+ struct xtime
+ {
+ #if defined(BOOST_NO_INT64_T)
+diff -up boost_1_48_0/libs/thread/src/pthread/timeconv.inl\~ boost_1_48_0/libs/thread/src/pthread/timeconv.inl
+--- boost_1_48_0/libs/thread/src/pthread/timeconv.inl~	2010-04-01 17:04:15.000000000 +0200
++++ boost_1_48_0/libs/thread/src/pthread/timeconv.inl	2012-05-24 20:55:43.000000000 +0200
+@@ -20,8 +20,8 @@ const int NANOSECONDS_PER_MICROSECOND =
+ inline void to_time(int milliseconds, boost::xtime& xt)
+ {
+     int res = 0;
+-    res = boost::xtime_get(&xt, boost::TIME_UTC);
+-    BOOST_ASSERT(res == boost::TIME_UTC);
++    res = boost::xtime_get(&xt, TIME_UTC);
++    BOOST_ASSERT(res == TIME_UTC);
+ 
+     xt.sec += (milliseconds / MILLISECONDS_PER_SECOND);
+     xt.nsec += ((milliseconds % MILLISECONDS_PER_SECOND) *
+@@ -57,8 +57,8 @@ inline void to_timespec_duration(const b
+ {
+     boost::xtime cur;
+     int res = 0;
+-    res = boost::xtime_get(&cur, boost::TIME_UTC);
+-    BOOST_ASSERT(res == boost::TIME_UTC);
++    res = boost::xtime_get(&cur, TIME_UTC);
++    BOOST_ASSERT(res == TIME_UTC);
+ 
+     if (boost::xtime_cmp(xt, cur) <= 0)
+     {
+@@ -88,8 +88,8 @@ inline void to_duration(boost::xtime xt,
+ {
+     boost::xtime cur;
+     int res = 0;
+-    res = boost::xtime_get(&cur, boost::TIME_UTC);
+-    BOOST_ASSERT(res == boost::TIME_UTC);
++    res = boost::xtime_get(&cur, TIME_UTC);
++    BOOST_ASSERT(res == TIME_UTC);
+ 
+     if (boost::xtime_cmp(xt, cur) <= 0)
+         milliseconds = 0;
+@@ -110,8 +110,8 @@ inline void to_microduration(boost::xtim
+ {
+     boost::xtime cur;
+     int res = 0;
+-    res = boost::xtime_get(&cur, boost::TIME_UTC);
+-    BOOST_ASSERT(res == boost::TIME_UTC);
++    res = boost::xtime_get(&cur, TIME_UTC);
++    BOOST_ASSERT(res == TIME_UTC);
+ 
+     if (boost::xtime_cmp(xt, cur) <= 0)
+         microseconds = 0;
diff --git a/boost.spec b/boost.spec
index 1b42e77..f0f8aff 100644
--- a/boost.spec
+++ b/boost.spec
@@ -144,6 +144,10 @@ Patch12: boost-1.48.0-polygon.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=807780
 Patch13: boost-1.48.0-python3.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=824810
+# https://svn.boost.org/trac/boost/ticket/6940
+Patch14: boost-1.48.0-xtime.patch
+
 %bcond_with tests
 %bcond_with docs_generated
 
@@ -531,6 +535,7 @@ sed 's/_FEDORA_SONAME/%{sonamever}/' %{PATCH1} | %{__patch} -p0 --fuzz=0
 %patch11 -p1
 %patch12 -p3
 %patch13 -p1
+%patch14 -p1
 
 %build
 # Support for building tests.
@@ -1072,6 +1077,11 @@ rm -rf $RPM_BUILD_ROOT
 * Thu May 24 2012 Petr Machata <pmachata@redhat.com> - 1.48.0-14
 - Don't attempt to install Python 3 portions of boost when given
   --without python3
+- glibc newly defines a macro TIME_UTC, which collides with
+  boost::TIME_UTC.  We can't avoid expanding that macro, but the value
+  happens to be the same as that of boost::TIME_UTC.  So drop enum
+  xtime_clock_types.  Update boost to use macro TIME_UTC instead of
+  the scoped enum value.  External clients will have to do the same.
 - Resolves: #824810
 - BR on hwloc-devel shouldn't be required anymore (see #814798)