$NetBSD: patch-core_src_lmdb_mdb.c,v 1.3 2021/02/01 09:08:43 kardel Exp $

	use POSIX semaphores on NetBSD

--- core/src/lmdb/mdb.c.orig	2020-12-16 07:46:16.000000000 +0000
+++ core/src/lmdb/mdb.c
@@ -150,7 +150,11 @@ typedef SSIZE_T	ssize_t;
 
 #if defined(__APPLE__) || defined (BSD)
 # if !(defined(MDB_USE_POSIX_MUTEX) || defined(MDB_USE_POSIX_SEM))
-# define MDB_USE_SYSV_SEM	1
+#   if defined(__NetBSD__)
+#     define MDB_USE_POSIX_SEM	1
+#   else
+#     define MDB_USE_SYSV_SEM	1
+#   endif
 # endif
 # define MDB_FDATASYNC		fsync
 #elif defined(ANDROID)