udhcpc: option -x OPT:VAL clarification

[Abdoulaye Walsimou GAYE]

Can someone clarify usage of -x OPT:VAL please?
I my case I want to use it to encode dhcp option 125[1], vendor 
identifying vendor options.
I want to know how VAL need to be in order to send dhcp option 125.

from [1] ----------------------------------------------------
    The format of the V-I Vendor-specific Information option is as
    follows:
     0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |  option-code  |  option-len   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |      enterprise-number1       |
    |                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |   data-len1   |               |
    +-+-+-+-+-+-+-+-+ option-data1  |

------------------------------------------------------------------------

Does this possible without hack of the current udhcpc code?
Thanks,
AWG

[1] http://tools.ietf.org/html/rfc3925