Patch developed inhouse and has been accepted by the community.

Details can be found at

https://sourceforge.net/p/net-snmp/bugs/2654/

The community patch differs slightly from this as it needs to be

generic for all OSes, hence they have included an extra check for the availability

of the forkall function. 

--- net-snmp-5.4.1.old/apps/snmptrapd.c	2007-06-08 03:44:37.000000000 -0700

+++ net-snmp-5.4.1/apps/snmptrapd.c	2015-05-20 05:12:11.512063848 -0700

@@ -1237,7 +1237,7 @@

     if (dofork && netsnmp_running) {

         int             fd;

-        switch (fork()) {

+        switch (forkall()) {

         case -1:

             fprintf(stderr, "bad fork - %s\n", strerror(errno));

             _exit(1);