diff --git a/src/m4/ax_boost_thread.m4 b/src/m4/ax_boost_thread.m4
index d9cd8a1d1d..79e12cdb4e 100644
--- a/src/m4/ax_boost_thread.m4
+++ b/src/m4/ax_boost_thread.m4
@@ -30,7 +30,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 22
+#serial 27
 
 AC_DEFUN([AX_BOOST_THREAD],
 [
@@ -68,17 +68,13 @@ AC_DEFUN([AX_BOOST_THREAD],
         [AC_LANG_PUSH([C++])
 			 CXXFLAGS_SAVE=$CXXFLAGS
 
-			 # let us handle platform dependent issues in
-			 # configure.ac
-
-			 # if test "x$build_os" = "xsolaris" ; then
-			 # 	 CXXFLAGS="-pthreads $CXXFLAGS"
-			 # elif test "x$build_os" = "xming32" ; then
-			 # 	 CXXFLAGS="-mthreads $CXXFLAGS"
-			 # else
-			 # 	CXXFLAGS="-pthread $CXXFLAGS"
-			 # fi
-
+			 if test "x$host_os" = "xsolaris" ; then
+				 CXXFLAGS="-pthreads $CXXFLAGS"
+			 elif test "x$host_os" = "xmingw32" ; then
+				 CXXFLAGS="-mthreads $CXXFLAGS"
+			 else
+				CXXFLAGS="-pthread $CXXFLAGS"
+			 fi
 			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/thread/thread.hpp>]],
                                    [[boost::thread_group thrds;
                                    return 0;]])],
@@ -87,13 +83,13 @@ AC_DEFUN([AX_BOOST_THREAD],
              AC_LANG_POP([C++])
 		])
 		if test "x$ax_cv_boost_thread" = "xyes"; then
-           # if test "x$build_os" = "xsolaris" ; then
-	   # 		  BOOST_CPPFLAGS="-pthreads $BOOST_CPPFLAGS"
-	   # 	   elif test "x$build_os" = "xming32" ; then
-	   # 		  BOOST_CPPFLAGS="-mthreads $BOOST_CPPFLAGS"
-	   # 	   else
-	   # 		  BOOST_CPPFLAGS="-pthread $BOOST_CPPFLAGS"
-	   # 	   fi
+           if test "x$host_os" = "xsolaris" ; then
+			  BOOST_CPPFLAGS="-pthreads $BOOST_CPPFLAGS"
+		   elif test "x$host_os" = "xmingw32" ; then
+			  BOOST_CPPFLAGS="-mthreads $BOOST_CPPFLAGS"
+		   else
+			  BOOST_CPPFLAGS="-pthread $BOOST_CPPFLAGS"
+		   fi
 
 			AC_SUBST(BOOST_CPPFLAGS)
 
@@ -101,21 +97,21 @@ AC_DEFUN([AX_BOOST_THREAD],
             BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
 
 			LDFLAGS_SAVE=$LDFLAGS
-                        # case "x$build_os" in
-                        #   *bsd* )
-                        #        LDFLAGS="-pthread $LDFLAGS"
-                        #   break;
-                        #   ;;
-                        # esac
+                        case "x$host_os" in
+                          *bsd* )
+                               LDFLAGS="-pthread $LDFLAGS"
+                          break;
+                          ;;
+                        esac
             if test "x$ax_boost_user_thread_lib" = "x"; then
-                for libextension in `ls $BOOSTLIBDIR/libboost_thread*.so* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_thread.*\)\.so.*$;\1;'` `ls $BOOSTLIBDIR/libboost_thread*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_thread.*\)\.a*$;\1;'`; do
+                for libextension in `ls -r $BOOSTLIBDIR/libboost_thread* 2>/dev/null | sed 's,.*/lib,,' | sed 's,\..*,,'`; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_THREAD_LIB="-l$ax_lib"; AC_SUBST(BOOST_THREAD_LIB) link_thread="yes"; break],
                                  [link_thread="no"])
 				done
                 if test "x$link_thread" != "xyes"; then
-                for libextension in `ls $BOOSTLIBDIR/boost_thread*.dll* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_thread.*\)\.dll.*$;\1;'` `ls $BOOSTLIBDIR/boost_thread*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_thread.*\)\.a*$;\1;'` ; do
+                for libextension in `ls -r $BOOSTLIBDIR/boost_thread* 2>/dev/null | sed 's,.*/,,' | sed 's,\..*,,'`; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_THREAD_LIB="-l$ax_lib"; AC_SUBST(BOOST_THREAD_LIB) link_thread="yes"; break],
@@ -134,17 +130,17 @@ AC_DEFUN([AX_BOOST_THREAD],
             if test "x$ax_lib" = "x"; then
                 AC_MSG_ERROR(Could not find a version of the library!)
             fi
-			# if test "x$link_thread" = "xno"; then
-			# 	AC_MSG_ERROR(Could not link against $ax_lib !)
-                        # else
-                        #    case "x$build_os" in
-                        #       *bsd* )
-			# 	BOOST_LDFLAGS="-pthread $BOOST_LDFLAGS"
-                        #       break;
-                        #       ;;
-                        #    esac
+			if test "x$link_thread" = "xno"; then
+				AC_MSG_ERROR(Could not link against $ax_lib !)
+                        else
+                           case "x$host_os" in
+                              *bsd* )
+				BOOST_LDFLAGS="-pthread $BOOST_LDFLAGS"
+                              break;
+                              ;;
+                           esac
 
-			# fi
+			fi
 		fi
 
 		CPPFLAGS="$CPPFLAGS_SAVED"