Index: Makefile
===================================================================
--- Makefile
+++ Makefile
@@ -102,6 +102,9 @@
 # end of option vars
 
 CFLAGS+=	-fPIC
+# 2019-01-25: -pthread in LIBS is a work around for the following bug:
+# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235211
+LIBS+= 	-pthread
 
 WITHOUT_NO_STRICT_ALIASING=yes