This patch additionally fixes the manpage.

--- mailx-12.4/Makefile.old	2008-07-28 22:33:38.000000000 +0000
+++ mailx-12.4/Makefile	2020-01-15 02:29:34.445930298 +0000
@@ -13,7 +13,7 @@
 
 MAILRC		= $(SYSCONFDIR)/nail.rc
 MAILSPOOL	= /var/mail
-SENDMAIL	= /usr/lib/sendmail
+SENDMAIL	= /usr/sbin/sendmail
 
 DESTDIR		=
 
--- mailx-12.4/mailx.1.old	2020-01-15 02:20:57.711188031 +0000
+++ mailx-12.4/mailx.1	2020-01-15 02:29:50.274237107 +0000
@@ -4907,7 +4907,7 @@
 which just acts as a proxy.
 .PP
 \fIMailx\fR immediately contacts the SMTP server (or
-.IR \%/usr/lib/sendmail )
+.IR \%/usr/sbin/sendmail )
 even when operating in
 .I disconnected
 mode.