Description of problem:

eximon dies on Fedora 4 with the following message, worked fine in Fedora 3.
Problem still present in recent 4.60-4 update

Exim Monitor version 2.05 (compiled 5-Oct-2005 06:17:32) initializing
.*** buffer overflow detected ***: /usr/sbin/eximon.bin terminated

Reason: in FC4 glibc has been compiled with FORTIFY_SOURCE. 
basename is defined to short to hold the \0

Patch that worked for me and has been included upstream (bug #73 on exim.org)

--- exim-4.54/exim_monitor/em_queue.c.orig      2006-01-22 11:00:03.000000000 +0100
+++ exim-4.54/exim_monitor/em_queue.c   2006-01-22 10:58:42.000000000 +0100
@@ -497,7 +497,7 @@
         name[SPOOL_NAME_LENGTH - 2] == '-' &&
         name[SPOOL_NAME_LENGTH - 1] == 'H')
       {
-      uschar basename[SPOOL_NAME_LENGTH];
+      uschar basename[SPOOL_NAME_LENGTH+1];
       stripchart_total[0]++;
       if (!eximon_initialized) { printf("."); fflush(stdout); }
       Ustrcpy(basename, name);

Additional info: