help using -m option

Hopefully I'm just missing something simple, but I can't seem to get
the -m option to limit what mibs get read on an snmp get

For example:
snmpget -m CISCO-CONFIG-MAN-MIB -OqUtv \
   $DEV CISCO-CONFIG-MAN-MIB::ccmHistoryRunningLastChanged.0

reads lots more than CISCO-CONFIG-MAN-MIB.my & the mibs it references.
 Same thing if using
  -mCISCO-CONFIG-MAN-MIB
or
  -Ymibfile="$S/cisco/CISCO-CONFIG-MAN-MIB.my"

Environment is Windows XP, cygwin, net-snmp 5.6.rc2 build from source
using cygwin with the following environment variables set in a cygwin
bash shell:
   export S="/usr/local/share/snmp/mibs"
   export MIBDIRS="$S;$S/cisco"
   export MIBS=ALL
   export SNMPCONFPATH="$HOME/.snmp"
   export SNMP_PERSISTENT_DIR="$HOME/.snmp"
   export SNMPSHAREPATH="/usr/local/share/snmp"

The man page says the -m option is supposed to over-ride the MIBS
envar, but I've also tried
MIBS=""
unset MIBS
and it doesn't make any difference.  Run the Sysinternals Process
Monitor tool, set the filter to show file reads, do the snmp get and
watch lots of files in $S/cisco being read (I've got almost 300 mib
files there - I haven't counted how many process monitor shows being
read)

I suspect this is just something really simple I'm missing, but darn
if I can figure it out :(

Lee

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