'MCLBYTES' undeclared here BSP

[mfg]

Hello guys.

Whenever I build a project after to create a new BSP the next error 
appears:

/home/marco/BSPs/ZedboardBACON/arm-rtems4.12/xilinx_zynq_zedboard/lib/include/sys/mbuf.h:193:15: 
error: 'MCLBYTES' undeclared here (not in a function)
Normally I declare the variable with a value 256, 512, 1024 or 2048 and 
I can continue without errors. I would like to know if I am doing 
something silly or if that value should be fixed or it would have to be 
declared elsewhere.
Thanks in advance.

Marco Fuentes García