diff -ruN imap-4.6.BETA.orig/src/osdep/unix/Makefile imap-4.6.BETA/src/osdep/unix/Makefile
--- imap-4.6.BETA.orig/src/osdep/unix/Makefile	Mon Mar 15 19:56:46 1999
+++ imap-4.6.BETA/src/osdep/unix/Makefile	Sun May  2 00:41:10 1999
@@ -75,8 +75,8 @@
 # set certain other formats (e.g. mbx and mx) as the EMPTYPROTO since these
 # formats can never be empty files.
 
-CREATEPROTO=unixproto
-EMPTYPROTO=unixproto
+CREATEPROTO=mbxproto
+EMPTYPROTO=mbxproto
 
 
 # Commands possibly overriden by the individual port