* configure.in (LIB_PTHREAD): Prepend -lpthread to LIBS (Bug#9852)

if the library is found.  Otherwise, later configure-time tests,
such as the test for pthread_sigmask, generate the wrong results
on some platforms.  Problem reported for FreeBSD by Nali Toja.

ChangeLog

+2011-10-24  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* configure.in (LIB_PTHREAD): Prepend -lpthread to LIBS (Bug#9852)
+	if the library is found.  Otherwise, later configure-time tests,
+	such as the test for pthread_sigmask, generate the wrong results
+	on some platforms.  Problem reported for FreeBSD by Nali Toja.
+
 2011-10-20  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Time zone name fixes for non-ASCII locales (Bug#641, Bug#9794)

configure.in

@@ -1723,7 +1723,8 @@ fi
 if test "$HAVE_PTHREAD" = yes; then
   case "${canonical}" in
     *-hpux*) ;;
-    *) LIB_PTHREAD="-lpthread" ;;
+    *) LIB_PTHREAD="-lpthread"
+       LIBS="$LIB_PTHREAD $LIBS" ;;
   esac
   AC_DEFINE(HAVE_PTHREAD, 1, [Define to 1 if you have pthread (-lpthread).])
 fi