diff -dPNur bsd-mailx-8.1.2-0.20160123cvs.orig/Makefile bsd-mailx-8.1.2-0.20160123cvs.orig-ds/Makefile
--- bsd-mailx-8.1.2-0.20160123cvs.orig/Makefile	2018-04-10 22:47:18.000000000 +0000
+++ bsd-mailx-8.1.2-0.20160123cvs.orig-ds/Makefile	2018-04-10 22:49:25.000000000 +0000
@@ -10,7 +10,7 @@
 	popen.c quit.c send.c strings.c temp.c tty.c vars.c
 
 OBJS=$(SRCS:%.c=%.o)
-LIBS=-llockfile -lbsd
+LIBS=-llockfile -lbsd -lrt
 
 SFILES=	mail.help mail.tildehelp
 EFILES=	mail.rc