commit 19dc79812b2bdb803bd2e68e15b7a48d6e19c2fa
Author: Howard Chu <hyc@openldap.org>
Date:   Wed Nov 11 00:02:06 2015 +0000

    Tweak robust mutex detection for glibc

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 6d9e0a4..b66916c 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -262,12 +262,19 @@ union semun {
  * either.)
  */
 #ifndef MDB_USE_ROBUST
-/* Android currently lacks Robust Mutex support */
-#if defined(ANDROID) && defined(MDB_USE_POSIX_MUTEX) && !defined(MDB_USE_ROBUST)
-#define MDB_USE_ROBUST	0
-#else
-#define MDB_USE_ROBUST	1
-#endif
+/* Android currently lacks Robust Mutex support. So does glibc < 2.4. */
+# if defined(MDB_USE_POSIX_MUTEX) && (defined(ANDROID) || \
+	(defined(__GLIBC__) && !__GLIBC_PREREQ(2, 4)))
+#  define MDB_USE_ROBUST	0
+# else
+#  define MDB_USE_ROBUST	1
+/* glibc < 2.10 only provided _np API */
+#  if !__GLIBC_PREREQ(2, 10)
+#   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