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-rw-r--r--libstdc++-v3/config.h.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index adc7d44ee48..26ccd22de2d 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -851,6 +851,9 @@
/* Define if pthreads_num_processors_np is available in <pthread.h>. */
#undef _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP
+/* Define if POSIX read/write locks are available in <gthr.h>. */
+#undef _GLIBCXX_USE_PTHREAD_RWLOCK_T
+
/* Define if /dev/random and /dev/urandom are available for the random_device
of TR1 (Chapter 5.1). */
#undef _GLIBCXX_USE_RANDOM_TR1