diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 695d116..ad95285 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -4616,10 +4616,18 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
 		sem_unlink(env->me_txns->mti_wmname);
 		env->me_rmutex = sem_open(env->me_txns->mti_rmname,
 			O_CREAT|O_EXCL, mode, 1);
-		if (env->me_rmutex == SEM_FAILED) goto fail_errno;
+		if (env->me_rmutex == SEM_FAILED)
+                {
+                    printf("Failed sem_open 1\n");
+                    goto fail_errno;
+                }
 		env->me_wmutex = sem_open(env->me_txns->mti_wmname,
 			O_CREAT|O_EXCL, mode, 1);
-		if (env->me_wmutex == SEM_FAILED) goto fail_errno;
+		if (env->me_wmutex == SEM_FAILED)
+                {
+                    printf("Failed sem_open 2\n");
+                    goto fail_errno;
+                }
 #else	/* MDB_USE_POSIX_MUTEX: */
 		pthread_mutexattr_t mattr;
 
@@ -4662,9 +4670,17 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
 		if (!env->me_wmutex) goto fail_errno;
 #elif defined(MDB_USE_POSIX_SEM)
 		env->me_rmutex = sem_open(env->me_txns->mti_rmname, 0);
-		if (env->me_rmutex == SEM_FAILED) goto fail_errno;
+		if (env->me_rmutex == SEM_FAILED)
+                {
+                    printf("Failed sem_open 3\n");
+                    goto fail_errno;
+                }
 		env->me_wmutex = sem_open(env->me_txns->mti_wmname, 0);
-		if (env->me_wmutex == SEM_FAILED) goto fail_errno;
+		if (env->me_wmutex == SEM_FAILED)
+                {
+                    printf("Failed sem_open 4\n");
+                    goto fail_errno;
+                }
 #endif
 	}
 	return MDB_SUCCESS;