diff --git a/libc/bionic/pthread.c b/libc/bionic/pthread.c
index ec3c459..5712840 100644
--- a/libc/bionic/pthread.c
+++ b/libc/bionic/pthread.c
@@ -1204,6 +1204,7 @@
 }
 
 
+/* this one exists only for backward binary compatibility */
 int pthread_cond_timedwait_monotonic(pthread_cond_t *cond,
                                      pthread_mutex_t * mutex,
                                      const struct timespec *abstime)
@@ -1211,6 +1212,20 @@
     return __pthread_cond_timedwait(cond, mutex, abstime, CLOCK_MONOTONIC);
 }
 
+int pthread_cond_timedwait_monotonic_np(pthread_cond_t *cond,
+                                     pthread_mutex_t * mutex,
+                                     const struct timespec *abstime)
+{
+    return __pthread_cond_timedwait(cond, mutex, abstime, CLOCK_MONOTONIC);
+}
+
+int pthread_cond_timedwait_relative_np(pthread_cond_t *cond,
+                                      pthread_mutex_t * mutex,
+                                      const struct timespec *reltime)
+{
+    return __pthread_cond_timedwait_relative(cond, mutex, reltime);
+}
+
 int pthread_cond_timeout_np(pthread_cond_t *cond,
                             pthread_mutex_t * mutex,
                             unsigned msecs)
diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index e3afdae..ae7b758 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -179,10 +179,30 @@
  *         to the CLOCK_MONOTONIC clock instead, to avoid any problems when
  *         the wall-clock time is changed brutally
  */
+int pthread_cond_timedwait_monotonic_np(pthread_cond_t         *cond,
+                                        pthread_mutex_t        *mutex,
+                                        const struct timespec  *abstime);
+
+/* BIONIC: DEPRECATED. same as pthread_cond_timedwait_monotonic_np()
+ * unfortunately pthread_cond_timedwait_monotonic has shipped already
+ */
 int pthread_cond_timedwait_monotonic(pthread_cond_t         *cond,
                                      pthread_mutex_t        *mutex,
                                      const struct timespec  *abstime);
 
+#define HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC 1
+
+/* BIONIC: same as pthread_cond_timedwait, except the 'reltime' given refers
+ *         is relative to the current time.
+ */
+int pthread_cond_timedwait_relative_np(pthread_cond_t         *cond,
+                                     pthread_mutex_t        *mutex,
+                                     const struct timespec  *reltime);
+
+#define HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE 1
+
+
+
 int pthread_cond_timeout_np(pthread_cond_t *cond,
                             pthread_mutex_t * mutex,
                             unsigned msecs);