diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index a9ebbc3..6633f92 100644
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -238,12 +238,12 @@
 	 *	@note In the #MDB_node structure, we only store 48 bits of this value,
 	 *	which thus limits us to only 60 bits of addressable data.
 	 */
-typedef ID	pgno_t;
+typedef MDB_ID	pgno_t;
 
 	/** A transaction ID.
 	 *	See struct MDB_txn.mt_txnid for details.
 	 */
-typedef ID	txnid_t;
+typedef MDB_ID	txnid_t;
 
 /** @defgroup debug	Debug Macros
  *	@{
@@ -819,9 +819,9 @@ struct MDB_txn {
 	MDB_env		*mt_env;		/**< the DB environment */
 	/** The list of pages that became unused during this transaction.
 	 */
-	IDL			mt_free_pgs;
+	MDB_IDL		mt_free_pgs;
 	union {
-		ID2L	dirty_list;	/**< modified pages */
+		MDB_ID2L	dirty_list;	/**< modified pages */
 		MDB_reader	*reader;	/**< this thread's slot in the reader table */
 	} mt_u;
 	/** Array of records for each DB known in the environment. */
@@ -961,9 +961,9 @@ struct MDB_env {
 	pthread_key_t	me_txkey;	/**< thread-key for readers */
 	MDB_page	*me_dpages;		/**< list of malloc'd blocks for re-use */
 	/** IDL of pages that became unused in a write txn */
-	IDL			me_free_pgs;
+	MDB_IDL		me_free_pgs;
 	/** ID2L of pages that were written during a write txn */
-	ID2			me_dirty_list[MDB_IDL_UM_SIZE];
+	MDB_ID2		me_dirty_list[MDB_IDL_UM_SIZE];
 	/** rwlock for the DB tables, if #LAZY_LOCKS is false */
 	LAZY_RWLOCK_DEF(me_dblock)
 #ifdef _WIN32
@@ -1129,14 +1129,14 @@ static void mdb_audit(MDB_txn *txn)
 {
 	MDB_cursor mc;
 	MDB_val key, data;
+	MDB_ID freecount, count;
 	MDB_dbi i;
 	int rc;
-	ID freecount, count;
 
 	freecount = 0;
 	mdb_cursor_init(&mc, txn, FREE_DBI, NULL);
 	while ((rc = mdb_cursor_get(&mc, &key, &data, MDB_NEXT)) == 0)
-		freecount += *(ID *)data.mv_data;
+		freecount += *(MDB_ID *)data.mv_data;
 	freecount += txn->mt_dbs[0].md_branch_pages + txn->mt_dbs[0].md_leaf_pages +
 		txn->mt_dbs[0].md_overflow_pages;
 
@@ -1217,7 +1217,7 @@ mdb_page_alloc(MDB_cursor *mc, int num)
 	MDB_txn *txn = mc->mc_txn;
 	MDB_page *np;
 	pgno_t pgno = P_INVALID;
-	ID2 mid;
+	MDB_ID2 mid;
 
 	if (txn->mt_txnid > 2) {
 
@@ -1272,7 +1272,7 @@ again:
 				txn->mt_env->me_pglast = last;
 				if (!txn->mt_env->me_pgfirst)
 					txn->mt_env->me_pgfirst = last;
-				idl = (ID *) data.mv_data;
+				idl = (MDB_ID *) data.mv_data;
 				/* We might have a zero-length IDL due to freelist growth
 				 * during a prior commit
 				 */
@@ -1410,7 +1410,7 @@ finish:
 			mc->mc_db->md_root = mp->mp_pgno;
 	} else if (mc->mc_txn->mt_parent) {
 		MDB_page *np;
-		ID2 mid;
+		MDB_ID2 mid;
 		/* If txn has a parent, make sure the page is in our
 		 * dirty list.
 		 */
@@ -1679,7 +1679,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
 			free(txn);
 			return ENOMEM;
 		}
-		txn->mt_u.dirty_list = malloc(sizeof(ID2)*MDB_IDL_UM_SIZE);
+		txn->mt_u.dirty_list = malloc(sizeof(MDB_ID2)*MDB_IDL_UM_SIZE);
 		if (!txn->mt_u.dirty_list) {
 			free(txn->mt_free_pgs);
 			free(txn);
@@ -1866,7 +1866,7 @@ mdb_txn_commit(MDB_txn *txn)
 		MDB_db *ip, *jp;
 		MDB_dbi i;
 		unsigned x, y;
-		ID2L dst, src;
+		MDB_ID2L dst, src;
 
 		/* Update parent's DB table */
 		ip = &txn->mt_parent->mt_dbs[2];
@@ -1961,7 +1961,7 @@ free2:
 #if MDB_DEBUG > 1
 		{
 			unsigned int i;
-			ID *idl = txn->mt_free_pgs;
+			MDB_IDL idl = txn->mt_free_pgs;
 			DPRINTF("IDL write txn %zu root %zu num %zu",
 				txn->mt_txnid, txn->mt_dbs[FREE_DBI].md_root, idl[0]);
 			for (i=0; i<idl[0]; i++) {
diff --git a/libraries/libmdb/midl.c b/libraries/libmdb/midl.c
index a2cb861..a3844d6 100644
--- a/libraries/libmdb/midl.c
+++ b/libraries/libmdb/midl.c
@@ -31,7 +31,7 @@
 #define CMP(x,y)	 ( (x) < (y) ? -1 : (x) > (y) )
 
 #if 0	/* superseded by append/sort */
-static unsigned mdb_midl_search( IDL ids, ID id )
+static unsigned mdb_midl_search( MDB_IDL ids, MDB_ID id )
 {
 	/*
 	 * binary search of id in ids
@@ -66,7 +66,7 @@ static unsigned mdb_midl_search( IDL ids, ID id )
 	return cursor;
 }
 
-int mdb_midl_insert( IDL ids, ID id )
+int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
 {
 	unsigned x, i;
 
@@ -104,7 +104,7 @@ int mdb_midl_insert( IDL ids, ID id )
 		} else {
 			ids[2] = ids[ids[0]-1];
 		}
-		ids[0] = NOID;
+		ids[0] = MDB_NOID;
 	
 	} else {
 		/* insert id */
@@ -117,23 +117,23 @@ int mdb_midl_insert( IDL ids, ID id )
 }
 #endif
 
-IDL mdb_midl_alloc()
+MDB_IDL mdb_midl_alloc()
 {
-	IDL ids = malloc((MDB_IDL_UM_MAX+1) * sizeof(ID));
+	MDB_IDL ids = malloc((MDB_IDL_UM_MAX+1) * sizeof(MDB_ID));
 	*ids++ = MDB_IDL_UM_MAX;
 	return ids;
 }
 
-void mdb_midl_free(IDL ids)
+void mdb_midl_free(MDB_IDL ids)
 {
 	free(ids-1);
 }
 
-int mdb_midl_shrink( IDL *idp )
+int mdb_midl_shrink( MDB_IDL *idp )
 {
-	IDL ids = *idp;
+	MDB_IDL ids = *idp;
 	if (ids[-1] > MDB_IDL_UM_MAX) {
-		ids = realloc(ids, (MDB_IDL_UM_MAX+1) * sizeof(ID));
+		ids = realloc(ids, (MDB_IDL_UM_MAX+1) * sizeof(MDB_ID));
 		*ids++ = MDB_IDL_UM_MAX;
 		*idp = ids;
 		return 1;
@@ -141,14 +141,14 @@ int mdb_midl_shrink( IDL *idp )
 	return 0;
 }
 
-int mdb_midl_append( IDL *idp, ID id )
+int mdb_midl_append( MDB_IDL *idp, MDB_ID id )
 {
-	IDL ids = *idp;
+	MDB_IDL ids = *idp;
 	/* Too big? */
 	if (ids[0] >= ids[-1]) {
-		IDL idn = ids-1;
+		MDB_IDL idn = ids-1;
 		/* grow it */
-		idn = realloc(idn, (*idn + MDB_IDL_UM_MAX + 1) * sizeof(ID));
+		idn = realloc(idn, (*idn + MDB_IDL_UM_MAX + 1) * sizeof(MDB_ID));
 		if (!idn)
 			return -1;
 		*idn++ += MDB_IDL_UM_MAX;
@@ -160,21 +160,21 @@ int mdb_midl_append( IDL *idp, ID id )
 	return 0;
 }
 
-int mdb_midl_append_list( IDL *idp, IDL app )
+int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app )
 {
-	IDL ids = *idp;
+	MDB_IDL ids = *idp;
 	/* Too big? */
 	if (ids[0] + app[0] >= ids[-1]) {
-		IDL idn = ids-1;
+		MDB_IDL idn = ids-1;
 		/* grow it */
-		idn = realloc(idn, (*idn + app[-1]) * sizeof(ID));
+		idn = realloc(idn, (*idn + app[-1]) * sizeof(MDB_ID));
 		if (!idn)
 			return -1;
 		*idn++ += app[-1];
 		ids = idn;
 		*idp = ids;
 	}
-	memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(ID));
+	memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(MDB_ID));
 	ids[0] += app[0];
 	return 0;
 }
@@ -185,12 +185,12 @@ int mdb_midl_append_list( IDL *idp, IDL app )
 #define	SWAP(a,b)	{ itmp=(a); (a)=(b); (b)=itmp; }
 
 void
-mdb_midl_sort( IDL ids )
+mdb_midl_sort( MDB_IDL ids )
 {
 	/* Max possible depth of int-indexed tree * 2 items/level */
 	int istack[sizeof(int)*CHAR_BIT * 2];
 	int i,j,k,l,ir,jstack;
-	ID a, itmp;
+	MDB_ID a, itmp;
 
 	ir = ids[0];
 	l = 1;
@@ -245,7 +245,7 @@ mdb_midl_sort( IDL ids )
 	}
 }
 
-unsigned mdb_mid2l_search( ID2L ids, ID id )
+unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id )
 {
 	/*
 	 * binary search of id in ids
@@ -280,7 +280,7 @@ unsigned mdb_mid2l_search( ID2L ids, ID id )
 	return cursor;
 }
 
-int mdb_mid2l_insert( ID2L ids, ID2 *id )
+int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id )
 {
 	unsigned x, i;
 
diff --git a/libraries/libmdb/midl.h b/libraries/libmdb/midl.h
index 59ed8cb..f072ca3 100644
--- a/libraries/libmdb/midl.h
+++ b/libraries/libmdb/midl.h
@@ -1,5 +1,5 @@
 /**	@file midl.h
- *	@brief ldap bdb back-end ID List header file.
+ *	@brief mdb ID List header file.
  *
  *	This file was originally part of back-bdb but has been
  *	modified for use in libmdb. Most of the macros defined
@@ -42,7 +42,7 @@ extern "C" {
 	/** A generic ID number. These were entryIDs in back-bdb.
 	 *	Preferably it should have the same size as a pointer.
 	 */
-typedef size_t ID;
+typedef size_t MDB_ID;
 
 	/** An IDL is an ID List, a sorted array of IDs. The first
 	 * element of the array is a counter for how many actual
@@ -50,9 +50,9 @@ typedef size_t ID;
 	 * sorted in ascending order. For libmdb IDLs are sorted in
 	 * descending order.
 	 */
-typedef ID *IDL;
+typedef MDB_ID *MDB_IDL;
 
-#define	NOID	(~(ID)0)
+#define	MDB_NOID	(~(MDB_ID)0)
 
 /* IDL sizes - likely should be even bigger
  *   limiting factors: sizeof(ID), thread stack size
@@ -60,24 +60,24 @@ typedef ID *IDL;
 #define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
 #define MDB_IDL_DB_SIZE		(1<<MDB_IDL_LOGN)
 #define MDB_IDL_UM_SIZE		(1<<(MDB_IDL_LOGN+1))
-#define MDB_IDL_UM_SIZEOF	(MDB_IDL_UM_SIZE * sizeof(ID))
+#define MDB_IDL_UM_SIZEOF	(MDB_IDL_UM_SIZE * sizeof(MDB_ID))
 
 #define MDB_IDL_DB_MAX		(MDB_IDL_DB_SIZE-1)
 
 #define MDB_IDL_UM_MAX		(MDB_IDL_UM_SIZE-1)
 
-#define MDB_IDL_IS_RANGE(ids)	((ids)[0] == NOID)
+#define MDB_IDL_IS_RANGE(ids)	((ids)[0] == MDB_NOID)
 #define MDB_IDL_RANGE_SIZE		(3)
-#define MDB_IDL_RANGE_SIZEOF	(MDB_IDL_RANGE_SIZE * sizeof(ID))
+#define MDB_IDL_RANGE_SIZEOF	(MDB_IDL_RANGE_SIZE * sizeof(MDB_ID))
 #define MDB_IDL_SIZEOF(ids)		((MDB_IDL_IS_RANGE(ids) \
-	? MDB_IDL_RANGE_SIZE : ((ids)[0]+1)) * sizeof(ID))
+	? MDB_IDL_RANGE_SIZE : ((ids)[0]+1)) * sizeof(MDB_ID))
 
 #define MDB_IDL_RANGE_FIRST(ids)	((ids)[1])
 #define MDB_IDL_RANGE_LAST(ids)		((ids)[2])
 
 #define MDB_IDL_RANGE( ids, f, l ) \
 	do { \
-		(ids)[0] = NOID; \
+		(ids)[0] = MDB_NOID; \
 		(ids)[1] = (f);  \
 		(ids)[2] = (l);  \
 	} while(0)
@@ -90,7 +90,7 @@ typedef ID *IDL;
 	} while(0)
 
 #define MDB_IDL_IS_ZERO(ids) ( (ids)[0] == 0 )
-#define MDB_IDL_IS_ALL( range, ids ) ( (ids)[0] == NOID \
+#define MDB_IDL_IS_ALL( range, ids ) ( (ids)[0] == MDB_NOID \
 	&& (ids)[1] <= (range)[1] && (range)[2] <= (ids)[2] )
 
 #define MDB_IDL_CPY( dst, src ) (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
@@ -111,66 +111,66 @@ typedef ID *IDL;
 	 * @param[in] id	The ID to insert.
 	 * @return	0 on success, -1 if the ID was already present in the IDL.
 	 */
-int mdb_midl_insert( IDL ids, ID id );
+int mdb_midl_insert( MDB_IDL ids, MDB_ID id );
 #endif
 
 	/** Allocate an IDL.
 	 * Allocates memory for an IDL of a default size.
 	 * @return	IDL on success, NULL on failure.
 	 */
-IDL mdb_midl_alloc();
+MDB_IDL mdb_midl_alloc();
 
 	/** Free an IDL.
 	 * @param[in] ids	The IDL to free.
 	 */
-void mdb_midl_free(IDL ids);
+void mdb_midl_free(MDB_IDL ids);
 
 	/** Shrink an IDL.
 	 * Return the IDL to the default size if it has grown larger.
 	 * @param[in,out] idp	Address of the IDL to shrink.
 	 * @return	0 on no change, non-zero if shrunk.
 	 */
-int mdb_midl_shrink(IDL *idp);
+int mdb_midl_shrink(MDB_IDL *idp);
 
 	/** Append an ID onto an IDL.
 	 * @param[in,out] idp	Address of the IDL to append to.
 	 * @param[in] id	The ID to append.
 	 * @return	0 on success, -1 if the IDL is too large.
 	 */
-int mdb_midl_append( IDL *idp, ID id );
+int mdb_midl_append( MDB_IDL *idp, MDB_ID id );
 
 	/** Append an IDL onto an IDL.
 	 * @param[in,out] idp	Address of the IDL to append to.
 	 * @param[in] app	The IDL to append.
 	 * @return	0 on success, -1 if the IDL is too large.
 	 */
-int mdb_midl_append_list( IDL *idp, IDL app );
+int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app );
 
 	/** Sort an IDL.
 	 * @param[in,out] ids	The IDL to sort.
 	 */
-void mdb_midl_sort( IDL ids );
+void mdb_midl_sort( MDB_IDL ids );
 
 	/** An ID2 is an ID/pointer pair.
 	 */
-typedef struct ID2 {
-	ID mid;			/**< The ID */
+typedef struct MDB_ID2 {
+	MDB_ID mid;		/**< The ID */
 	void *mptr;		/**< The pointer */
-} ID2;
+} MDB_ID2;
 
 	/** An ID2L is an ID2 List, a sorted array of ID2s.
 	 * The first element's \b mid member is a count of how many actual
 	 * elements are in the array. The \b mptr member of the first element is unused.
 	 * The array is sorted in ascending order by \b mid.
 	 */
-typedef ID2 *ID2L;
+typedef MDB_ID2 *MDB_ID2L;
 
 	/** Search for an ID in an ID2L.
 	 * @param[in] ids	The ID2L to search.
 	 * @param[in] id	The ID to search for.
 	 * @return	The index of the first ID2 whose \b mid member is greater than or equal to \b id.
 	 */
-unsigned mdb_mid2l_search( ID2L ids, ID id );
+unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id );
 
 
 	/** Insert an ID2 into a ID2L.
@@ -178,7 +178,7 @@ unsigned mdb_mid2l_search( ID2L ids, ID id );
 	 * @param[in] id	The ID2 to insert.
 	 * @return	0 on success, -1 if the ID was already present in the ID2L.
 	 */
-int mdb_mid2l_insert( ID2L ids, ID2 *id );
+int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
 
 /** @} */
 /** @} */