diff -ur imap/src/osdep/unix/Makefile
--- imap/src/osdep/unix/Makefile	Thu Jul 16 12:12:53 1998
+++ imap/src/osdep/unix/Makefile	Sat Aug  1 18:01:04 1998
@@ -186,6 +186,14 @@
 	 BASECFLAGS="-g -O -pipe -DNFSKLUDGE" \
 	 BASELDFLAGS="-lcrypt"
 
+bso:	# OpenBSD
+	$(BUILD) OS=bsi SIGTYPE=psx \
+	 SPOOLDIR=/var \
+	 ACTIVEFILE=/usr/local/news/lib/active \
+	 RSHPATH=/usr/bin/rsh \
+	 BASECFLAGS="-O2 -pipe -DNFSKLUDGE" \
+	 BASELDFLAGS=
+
 bsi:	# BSD/i386
 	$(BUILD) OS=$@ \
 	 MAILSPOOL=/var/mail NEWSSPOOL=/var/news/spool \
