+#ifdef __GLIBC__
+#define GLIBC_VER ((__GLIBC__ << 16 )| __GLIBC_MINOR__)
+#endif
+/** Some platforms define the EOWNERDEAD error code
+ * even though they don't support Robust Mutexes.
+ * Compile with -DMDB_USE_ROBUST=0, or use some other
+ * mechanism like -DMDB_USE_SYSV_SEM instead of
+ * -DMDB_USE_POSIX_MUTEX. (SysV semaphores are
+ * also Robust, but some systems don't support them
+ * either.)
+ */
+#ifndef MDB_USE_ROBUST
+/* Android currently lacks Robust Mutex support. So does glibc < 2.4. */
+# if defined(MDB_USE_POSIX_MUTEX) && (defined(ANDROID) || \
+ (defined(__GLIBC__) && GLIBC_VER < 0x020004))
+# define MDB_USE_ROBUST 0
+# else
+# define MDB_USE_ROBUST 1
+/* glibc < 2.12 only provided _np API */
+# if defined(__GLIBC__) && GLIBC_VER < 0x02000c
+# define PTHREAD_MUTEX_ROBUST PTHREAD_MUTEX_ROBUST_NP
+# define pthread_mutexattr_setrobust(attr, flag) pthread_mutexattr_setrobust_np(attr, flag)
+# define pthread_mutex_consistent(mutex) pthread_mutex_consistent_np(mutex)
+# endif
+# endif
+#endif /* MDB_USE_ROBUST */
+
+#if defined(MDB_OWNERDEAD) && MDB_USE_ROBUST