$OpenBSD: patch-Makefile,v 1.4 2018/05/02 19:21:53 naddy Exp $

Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -146,6 +146,7 @@ MOD_LFLAGS += -L$(SYSROOT)/local/lib
 endif
 
 LIBS      += -lrem -lm
+LIBS      += -lpthread
 LIBS      += -L$(SYSROOT)/lib
 
 ifeq ($(OS),win32)
