diff --git a/testsuites/psxtests/configure.ac b/testsuites/psxtests/configure.ac
index efe85f289f..3849690f7c 100644
--- a/testsuites/psxtests/configure.ac
+++ b/testsuites/psxtests/configure.ac
@@ -27,6 +27,9 @@ AM_CONDITIONAL([HAS_NETWORKING],[test "$HAS_NETWORKING" = "yes"])
 RTEMS_CHECK_CPUOPTS([RTEMS_POSIX_API])
 AM_CONDITIONAL(HAS_POSIX,test x"${rtems_cv_RTEMS_POSIX_API}" = x"yes")
 
+# FIXME: newlib should supply declaration of pthread_rwlock_unlock()
+AC_CHECK_DECLS([pthread_rwlock_unlock],[],[],[[#include <pthread.h>]])
+
 # Explicitly list all Makefiles here
 AC_CONFIG_FILES([Makefile
 psx01/Makefile
diff --git a/testsuites/psxtests/psxrwlock01/test.c b/testsuites/psxtests/psxrwlock01/test.c
index 11727c9e69..567d15d3da 100644
--- a/testsuites/psxtests/psxrwlock01/test.c
+++ b/testsuites/psxtests/psxrwlock01/test.c
@@ -19,6 +19,11 @@
 /* #define __USE_XOPEN2K XXX already defined on GNU/Linux */
 #include <pthread.h>
 
+#if !HAVE_DECL_PTHREAD_RWLOCK_UNLOCK
+/* FIXME: Newlib should provide the decl. */
+extern int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);
+#endif
+
 #define NUMBER_THREADS 2
 pthread_t ThreadIds[NUMBER_THREADS];
 pthread_rwlock_t RWLock;