This patch adds a VERSION variable to procmail.  It works the same as HOST --
if you try setting it a value that is not the specified version, processing
of the current rcfile will stop.  This isn't terribly useful as it doesn't
allow a range of version numbers, so using it in recipes may be preferred 
since it is allows a regex:

   LOG="Running procmail $VERSION on $HOST
   "

   :0:
   * VERSION ?? 3.11pre
   /dev/null

I don't recommend using the recipe above.  :)

Chris

----------------------------------------------------------------------
*** ./patchlevel.h   Sun Apr 27 19:27:41 1997
***************
*** 10,12 ****
--- 10,15 ----
  
  /* If the formatting or number of newlines of VERSION substantially changes,
     src/manconf.c needs to be changed as well */
+ 
+ /* change to whatever the procmail version is */
+ #define VERSIONNUMBER "v3.11pre7"
*** ./src/misc.c   Sun Apr 27 19:27:46 1997
***************
*** 21,26 ****
--- 21,27 ----
  #include "mcommon.h"
  #include "goodies.h"
  #include "locking.h"
+ #include "../patchlevel.h"
  #ifndef NO_COMSAT
  #include "network.h"
  #endif
***************
*** 35,41 ****
  struct varstr strenstr[]={{"SHELLMETAS",DEFshellmetas},{"LOCKEXT",DEFlockext},
   {"MSGPREFIX",DEFmsgprefix},{"COMSAT",""},{"TRAP",""},
   {"SHELLFLAGS",DEFshellflags},{"DEFAULT",DEFdefault},{"SENDMAIL",DEFsendmail},
!  {"SENDMAILFLAGS",DEFflagsendmail}};
  
  #define MAXvarvals    maxindex(strenvvar)
  #define MAXvarstrs    maxindex(strenstr)
--- 36,42 ----
  struct varstr strenstr[]={{"SHELLMETAS",DEFshellmetas},{"LOCKEXT",DEFlockext},
   {"MSGPREFIX",DEFmsgprefix},{"COMSAT",""},{"TRAP",""},
   {"SHELLFLAGS",DEFshellflags},{"DEFAULT",DEFdefault},{"SENDMAIL",DEFsendmail},
!  {"SENDMAILFLAGS",DEFflagsendmail},{"VERSION",VERSIONNUMBER}};
  
  #define MAXvarvals    maxindex(strenvvar)
  #define MAXvarstrs    maxindex(strenstr)
***************
*** 483,488 ****
--- 484,498 ----
     closerc();
        }
     }
+    else if (!strcmp (buf, "VERSION")) 
+     { const char*version;
+        if(strcmp(chp,VERSIONNUMBER)) 
+         { yell("VERSION mismatched", VERSIONNUMBER);
+    if(rc<0||!nextrcfile())           /* if no rcfile opened yet */
+       retval=EXIT_SUCCESS,Terminate();     /* exit gracefully as well */
+    closerc();
+         }
+    }
    else
     { int i=MAXvarvals;
       do                     /* several numeric assignments */