diff -wruN -x '*~' -x '*.o' -x '*.a' -x '*.so' -x '*.so.[0-9]' -x autom4te.cache -x .deps -x .libs ../orig-liblmdb/lmdump.c ./lmdump.c
--- ../orig-liblmdb/lmdump.c	1970-01-01 01:00:00.000000000 +0100
+++ ./lmdump.c	2014-07-28 17:50:23.263838569 +0200
@@ -0,0 +1,128 @@
+/* lmdump.c - Lmdb database dumper
+   Has three modes :
+     -a : print keys in ascii form
+     -A : print keys and values in ascii form
+     -x : print keys and values in hexadecimal form
+     -d : print only the size of keys and values
+ */
+
+#define _XOPEN_SOURCE 500        /* srandom(), random() */
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include "lmdb.h"
+
+static void print_hex(char *s,  int len) 
+{
+    int i = 0;
+    for (i=0; i<len; i++)
+    {
+        printf("%02x", s[i]);
+    }
+}
+
+static void print_usage(void) 
+{
+    printf("Lmdb database dumper\n");
+    printf("Usage: dump -d|-x|-a|-A filename\n\n");
+    printf("Has three modes :\n");
+    printf("    -a : print keys in ascii form\n");
+    printf("    -A : print keys and values in ascii form\n");
+    printf("    -x : print keys and values in hexadecimal form\n");
+    printf("    -d : print only the size of keys and values\n");
+}
+
+static int report_error(int rc) 
+{
+    printf("err(%d): %s\n", rc, mdb_strerror(rc));   
+    return rc;
+}
+
+int main(int argc, char * argv[])
+{
+    int rc;
+    MDB_env *env;
+    MDB_dbi dbi;
+    MDB_val key, data;
+    MDB_txn *txn;
+    MDB_cursor *cursor;
+
+    if (argc<3)
+    {
+        print_usage();
+        return 1;
+    }
+    int mode = -1;
+    if (strcmp(argv[1],"-a") == 0)
+    {
+        mode = 'a';
+    }
+    else if (strcmp(argv[1],"-A") == 0)
+    {
+        mode = 'A';
+    }
+    else if(strcmp(argv[1],"-x") == 0)
+    {
+        mode = 'x';
+    }
+    else if(strcmp(argv[1],"-d") == 0)
+    {
+        mode = 'd';
+    }
+    else
+    {
+        print_usage();
+        return 1;
+    }
+    rc = mdb_env_create(&env);
+    if(rc) return report_error(rc);
+
+    rc = mdb_env_open(env, argv[2], MDB_NOSUBDIR, 0644);
+    if(rc) return report_error(rc);
+
+    rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
+    if(rc) return report_error(rc);
+
+    rc = mdb_open(txn, NULL, 0, &dbi);
+    if(rc) return report_error(rc);
+
+    rc = mdb_cursor_open(txn, dbi, &cursor);
+    if(rc) return report_error(rc);
+
+    while( (rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) ==0)
+    {
+        if (mode == 'A')
+        {
+            printf("key: %p[%d] %.*s\n",
+                key.mv_data, (int) key.mv_size, (int) key.mv_size, (char *) key.mv_data);
+        }
+        else if (mode == 'a')
+        {
+            printf("key: %p[%d] %.*s, data: %p[%d] %.*s\n",
+                key.mv_data, (int) key.mv_size, (int) key.mv_size, (char *) key.mv_data,
+                data.mv_data, (int) data.mv_size, (int) data.mv_size, (char *) data.mv_data);
+        }
+        else if (mode == 'd')
+        {
+            printf("key: %p[%d] ,data: %p[%d]\n",
+                key.mv_data,  (int) key.mv_size,
+                data.mv_data, (int) data.mv_size);
+        }
+        else if (mode == 'x')
+        {
+            printf("key: %p[%d] ", key.mv_data,  (int) key.mv_size);
+            print_hex(key.mv_data,  (int) key.mv_size);
+            printf(" ,data: %p[%d] ", data.mv_data,  (int) data.mv_size);
+            print_hex(data.mv_data,  (int) data.mv_size);
+            printf("\n");
+        }
+    }
+    mdb_cursor_close(cursor);
+    mdb_close(env, dbi);
+
+    mdb_txn_abort(txn);
+    mdb_env_close(env);
+
+    return 0;
+}
diff -wruN -x '*~' -x '*.o' -x '*.a' -x '*.so' -x '*.so.[0-9]' -x autom4te.cache -x .deps -x .libs ../orig-liblmdb/lmmgr.c ./lmmgr.c
--- ../orig-liblmdb/lmmgr.c	1970-01-01 01:00:00.000000000 +0100
+++ ./lmmgr.c	2014-07-28 17:50:23.263838569 +0200
@@ -0,0 +1,201 @@
+/*
+lmmgr.c : Add, remove or manage the maxreaders value of a given database file
+*/
+#include <stdio.h>
+#include <string.h>
+#include "lmdb.h"
+
+static int report_error(int rc) 
+{
+    printf("err(%d): %s\n", rc, mdb_strerror(rc));   
+    return rc;
+}
+
+int openconn(const char *dbfile, MDB_env **env, long int maxreaders)
+{
+/*init*/
+    int rc;
+    rc = mdb_env_create(env);
+    if(rc) return report_error(rc);
+
+    rc = mdb_env_open(*env, dbfile, MDB_NOSUBDIR, 0644);
+    if(rc) return report_error(rc);
+    return 0;
+}
+
+int gettxn(MDB_env *env, MDB_txn **txn, MDB_dbi *dbi)
+{
+    int rc;
+/*setup txn*/
+    rc = mdb_txn_begin(env, NULL, 0, txn);
+    if(rc) return report_error(rc);
+    rc = mdb_open(*txn, NULL, 0, dbi);
+    if(rc) return report_error(rc);
+    return 0;
+}
+
+int committxn(MDB_txn *txn)
+{
+/*commit*/
+    int rc;
+    rc = mdb_txn_commit(txn);
+    return 0;
+}
+
+int aborttxn(MDB_txn *txn)
+{
+/*abort*/
+    int rc;
+    mdb_txn_abort(txn);
+    return 0;
+}
+
+int closeall(MDB_env *env, MDB_txn *txn, MDB_dbi dbi)
+{
+/*end*/
+    mdb_close(env, dbi);
+    mdb_env_close(env);
+    return 0;
+}
+
+int do_put(char *dbfile, char *mykey, char *myval)
+{
+    MDB_env *env;
+    openconn(dbfile, &env, 0);
+
+    MDB_txn *txn;
+    MDB_dbi dbi;
+    gettxn(env, &txn, &dbi);
+
+    int rc;
+    MDB_val key, data;
+    key.mv_data  = mykey;
+    data.mv_data = myval;
+    key.mv_size = strlen(mykey) + 1;
+    data.mv_size = strlen(myval) + 1;
+
+    rc = mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE);
+    if (rc == MDB_SUCCESS)
+    {
+        rc = mdb_txn_commit(txn);
+    }
+    else
+    {
+        mdb_txn_abort(txn);
+    }
+
+    mdb_env_close(env);
+    return rc;
+}
+
+int do_del(char *dbfile, char *mykey)
+{
+    MDB_env *env;
+    openconn(dbfile, &env, 0);
+
+    MDB_txn *txn;
+    MDB_dbi dbi;
+    gettxn(env, &txn, &dbi);
+
+    int rc;
+    MDB_val key;
+    key.mv_data  = mykey;
+    key.mv_size = strlen(mykey) + 1;
+
+    rc = mdb_del(txn, dbi, &key, NULL);
+    if (rc == MDB_SUCCESS)
+    {
+        rc = mdb_txn_commit(txn);
+    }
+    else
+    {
+        mdb_txn_abort(txn);
+    }
+
+    mdb_env_close(env);
+    return rc;
+}
+
+int do_init(char *dbfile, unsigned long maxr)
+{
+    MDB_env *env;
+    openconn(dbfile, &env, maxr);
+    mdb_env_close(env);
+    return 0;
+}
+
+int do_stat(char *dbfile)
+{
+    int rc;
+    MDB_env *env;
+    openconn(dbfile, &env, 0);
+
+    MDB_stat stat;
+    MDB_envinfo info;
+
+    rc = mdb_env_stat(env, &stat);
+    rc = mdb_env_info(env, &info);
+    printf("me_maxreaders=%ld\n", info.me_maxreaders);
+    mdb_env_close(env);
+    return 0;
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc < 3)
+    {
+        goto fail;
+    }
+
+    if (!strcmp(argv[1], "put"))
+    {
+        if (argc == 5)
+        {
+            int rc = do_put(argv[2], argv[3], argv[4]);
+            return rc;
+        }
+    }
+    else if (!strcmp(argv[1], "del"))
+    {
+        if (argc == 4)
+        {
+            int rc = do_del(argv[2], argv[3]);
+            return rc;
+        }
+    }
+    else if (!strcmp(argv[1], "init"))
+    {
+        if (argc == 3)
+        {
+            int rc = do_init(argv[2], 0L);
+            return rc;
+        }
+        else if (argc == 5 && !strcmp(argv[3], "-m"))
+        {
+            int rc = do_init(argv[2], atol(argv[4]));
+            do_stat(argv[2]);
+            return rc;
+        }
+    }
+    else if (!strcmp(argv[1], "maxr"))
+    {
+        if (argc == 3)
+        {
+            int rc = do_stat(argv[2]);
+            return rc;
+        }
+    }
+
+fail:
+    printf("Usage :\n");
+    printf("Add a key and value to a DB file :\n");
+    printf("\tlmmgr put dbfile key value\n");
+    printf("Remove a key from a DB file :\n");
+    printf("\tlmmgr del dbfile key\n");
+    printf("Set a new maxreaders value of a DB file :\n");
+    printf("\tlmmgr init dbfile [-m maxreaders]\n");
+    printf("Give maxreaders value of a DB file :\n");
+    printf("\tlmmgr maxr dbfile\n");
+
+    return 1;
+}
diff -wruN -x '*~' -x '*.o' -x '*.a' -x '*.so' -x '*.so.[0-9]' -x autom4te.cache -x .deps -x .libs ../orig-liblmdb/Makefile.am ./Makefile.am
--- ../orig-liblmdb/Makefile.am	2014-07-28 17:44:34.137071474 +0200
+++ ./Makefile.am	2014-07-28 17:58:11.979702178 +0200
@@ -4,7 +4,7 @@
 AM_CFLAGS = -W -Wall -Wno-unused-parameter -Wbad-function-cast -pthread
 LDADD = liblmdb.la
 
-bin_PROGRAMS = mdb_copy mdb_stat
+bin_PROGRAMS = mdb_copy mdb_stat lmdump lmmgr
 check_PROGRAMS = mtest mtest2 mtest3 mtest4 mtest5
 man_MANS = mdb_copy.1 mdb_stat.1
 include_HEADERS = lmdb.h