diff -ur ../../nmh-1.0.2-DIST/acconfig.h ./acconfig.h
--- ../../nmh-1.0.2-DIST/acconfig.h	Thu Oct 21 11:58:09 1999
+++ ./acconfig.h	Sat Dec 11 11:54:28 1999
@@ -104,7 +104,7 @@
  * The prefix which is prepended to the name of messages when they
  * are "removed" by rmm.  This should typically be `,' or `#'
  */
-#define BACKUP_PREFIX ","
+#define BACKUP_PREFIX "#"
 
 /*
  * Name of link to file to which you are replying.
@@ -128,11 +128,11 @@
 /* Defined for Solaris 2.x, Irix, OSF/1, HP-UX, AIX */
 #undef SVR4
 /* Defined for SunOS 4, FreeBSD, NetBSD, OpenBSD, BSD/OS, Mac OS X/Rhapsody */
-#undef BSD44
+#define BSD44
 
 /* Defined for SunOS 4, FreeBSD, NetBSD, OpenBSD, BSD/OS, Mac OS X/Rhapsody 
  * -- does PicoBSD have uname? :) */
-#undef BSD42
+#define BSD42
 
 /* Defined for SCO5 */
 #undef SCO_5_STDIO
@@ -231,7 +231,7 @@
  * not world writable.  There are no guarantees as to the safety of doing this,
  * but this #define will add some extra security checks.
  */
-#undef MAILGROUP
+#define MAILGROUP
 
 /* Define ruserpass as _ruserpass if your libraries have a bug *
  * such that it can't find ruserpass, but can find _ruserpass. */