diff --git a/src/mk/OpenBSD b/src/mk/OpenBSD
new file mode 100644
index 00000000..87896190
--- /dev/null
+++ b/src/mk/OpenBSD
@@ -0,0 +1,8 @@
+include $(depth)/mk/commondefs
+include $(depth)/mk/localdefs
+
+ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
+	 -pthread  \
+	 -DHAVE_VASPRINTF=1 \
+	 -DHAVE_MKDTEMP=1
+LIBSYS =