+if test x$pthread = xyes ; then
+ { echo "$as_me:$LINENO: checking for sem_timedwait in -lpthread" >&5
+echo $ECHO_N "checking for sem_timedwait in -lpthread... $ECHO_C" >&6; }
+if test "${ac_cv_lib_pthread_sem_timedwait+set}" = set; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+ ac_check_lib_save_LIBS=$LIBS
+LIBS="-lpthread $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+
+/* Override any GCC internal prototype to avoid an error.
+ Use char because int might match the return type of a GCC
+ builtin and then its argument prototype would still apply. */
+#ifdef __cplusplus
+extern "C"
+#endif
+char sem_timedwait ();
+int
+main ()
+{
+return sem_timedwait ();
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+ *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+ *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+ (eval "$ac_link") 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } && {
+ test -z "$ac_c_werror_flag" ||
+ test ! -s conftest.err
+ } && test -s conftest$ac_exeext &&
+ $as_test_x conftest$ac_exeext; then
+ ac_cv_lib_pthread_sem_timedwait=yes
+else
+ echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ ac_cv_lib_pthread_sem_timedwait=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+ conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_lib_pthread_sem_timedwait" >&5
+echo "${ECHO_T}$ac_cv_lib_pthread_sem_timedwait" >&6; }
+if test $ac_cv_lib_pthread_sem_timedwait = yes; then
+ HAVE_SEM_TIMEDWAIT=yes
+else
+ HAVE_SEM_TIMEDWAIT=no
+fi
+
+ if test ${HAVE_SEM_TIMEDWAIT} = yes ; then
+ { echo "$as_me:$LINENO: checking if sem_timedwait is compilable" >&5
+echo $ECHO_N "checking if sem_timedwait is compilable... $ECHO_C" >&6; }
+ cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+#include <semaphore.h>
+int
+main ()
+{
+sem_t *s; const struct timespec * t; sem_timedwait(s, t);
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+ *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+ *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+ (eval "$ac_compile") 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } && {
+ test -z "$ac_c_werror_flag" ||
+ test ! -s conftest.err
+ } && test -s conftest.$ac_objext; then
+ HAVE_SEM_TIMEDWAIT=yes
+else
+ echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ HAVE_SEM_TIMEDWAIT=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ if test ${HAVE_SEM_TIMEDWAIT} = yes ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_SEM_TIMEDWAIT 1
+_ACEOF
+
+ { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+ else
+ { echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+ fi
+ fi
+fi
+