Index: opal/mca/event/base/event_base_open.c
===================================================================
--- opal/mca/event/base/event_base_open.c	(revision 28396)
+++ opal/mca/event/base/event_base_open.c	(working copy)
@@ -71,10 +71,7 @@
         return rc;
     }

-    /* Declare our intent to use threads. If event library internal
-     * thread support was not enabled during configuration, this
-     * function defines to no-op
-     */
+    /* Declare our intent to use threads */
     opal_event_use_threads();

     /* get our event base */
Index: opal/mca/event/libevent2019/configure.m4
===================================================================
--- opal/mca/event/libevent2019/configure.m4	(revision 28396)
+++ opal/mca/event/libevent2019/configure.m4	(working copy)
@@ -91,7 +91,7 @@
     CPPFLAGS="-I$OMPI_TOP_SRCDIR -I$OMPI_TOP_BUILDDIR -I$OMPI_TOP_SRCDIR/opal/include $CPPFLAGS"

     AC_MSG_CHECKING([libevent configuration args])
-    event_args="--disable-dns --disable-http --disable-rpc --disable-openssl"
+    event_args="--disable-dns --disable-http --disable-rpc --disable-openssl --enable-thread-support"

     AC_ARG_ENABLE(event-rtsig,
         AC_HELP_STRING([--enable-event-rtsig],
@@ -150,18 +150,6 @@
         event_args="$event_args --enable-debug-mode"
     fi

-    AC_ARG_ENABLE(event-thread-support,
-                  AC_HELP_STRING([--enable-event-thread-support], [enable event library internal thread support]))
-    if test "$enable_event_thread_support" = "yes"; then
-        AC_DEFINE_UNQUOTED(OPAL_EVENT_HAVE_THREAD_SUPPORT, 1,
-                           [Thread support was configured into the event library])
-    else
-        event_args="$event_args --disable-thread-support"
-        AC_DEFINE_UNQUOTED(OPAL_EVENT_HAVE_THREAD_SUPPORT, 0,
-                           [Thread support was not configured into the event library])
-    fi
-    AM_CONDITIONAL(OPAL_EVENT_HAVE_THREAD_SUPPORT, test "$enable_event_thread_support" = "yes")
-
     AC_MSG_RESULT([$event_args])

     OMPI_CONFIG_SUBDIR([$basedir/libevent], 
Index: opal/mca/event/libevent2019/libevent2019.h
===================================================================
--- opal/mca/event/libevent2019/libevent2019.h	(revision 28396)
+++ opal/mca/event/libevent2019/libevent2019.h	(working copy)
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2010      Oracle and/or its affiliates.  All rights reserved.
- * Copyright (c) 2012      Los Alamos National Security, LLC.
+ * Copyright (c) 2012-2013 Los Alamos National Security, LLC.
  *                         All rights reserved.
  *
  * $COPYRIGHT$
@@ -99,15 +99,7 @@
 #define opal_event_set_priority(x, n) event_priority_set((x), (n))

 /* thread support APIs */
-#if OPAL_EVENT_HAVE_THREAD_SUPPORT
-#ifdef WIN32
-#define opal_event_use_threads() evthread_use_windows_threads()
-#else
 #define opal_event_use_threads() evthread_use_pthreads()
-#endif
-#else
-#define opal_event_use_threads()
-#endif

 /* Basic event APIs */
 #define opal_event_enable_debug_mode() event_enable_debug_mode()
Index: opal/mca/event/libevent2019/libevent2019_module.c
===================================================================
--- opal/mca/event/libevent2019/libevent2019_module.c	(revision 28396)
+++ opal/mca/event/libevent2019/libevent2019_module.c	(working copy)
@@ -88,11 +88,6 @@
         dumpit = true;
     }

-#if OPAL_EVENT_HAVE_THREAD_SUPPORT
-    /* turn on libevent thread safety */
-    evthread_use_pthreads ();
-#endif
-
     if (NULL == event_module_include) {
         /* Shouldn't happen, but... */
         event_module_include = strdup("select");