using bitbake to build libmodbus

Hi,
  I am using a ARM based development platform. I am using 'bitbake' to build my applications. I used the following recipe
http://git.openembedded.org/cgit.cgi/openembedded/tree/recipes/libmodbus (please check the link) to build libmodbus however I have been faced with these errors.

jm@jm-desktop:~/Desktop/corecdp-1.1.1$ bitbake libmodbus
NOTE: Handling BitBake files: / (7982/7982) [100 %]
Parsing of 7982 .bb files complete (7673 cached, 309 parsed). 7723 targets, 327 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
NOTE: Preparing runqueue
NOTE: Executing runqueue
NOTE: Running task 280 of 448 (ID: 1, /home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb, do_setscene)
NOTE: package libmodbus-2.0.3-r3.3: task do_setscene: Started
NOTE: package libmodbus-2.0.3-r3.3: task do_setscene: Succeeded
FATAL: libmodbus-2.0.3: http://github.com/downloads/stephane/libmodbus/libmodbus-2.0.3.tar.gz has no checksum defined, cannot check archive integrity
ERROR: Error in executing python function in: /home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb
ERROR: Exception:<type 'exceptions.SystemExit'> Message:1
ERROR: Printing the environment of the function
ERROR: Function base_do_fetch failed
ERROR: TaskFailed event exception, aborting
ERROR: Build of /home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb do_fetch failed
NOTE: Running task 433 of 448 (ID: 2, /home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb, do_fetch)
ERROR: Task 2 (/home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb, do_fetch) failed with 256
ERROR: '/home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb' failed
NOTE: package libmodbus-2.0.3-r3.3: task do_fetch: Started
NOTE: Missing checksum
FATAL: libmodbus-2.0.3: http://github.com/downloads/stephane/libmodbus/libmodbus-2.0.3.tar.gz has no checksum defined, cannot check archive integrity
ERROR: '/home/jm/Desktop/corecdp-1.1.1/user-collection/recipes/libmodbus/libmodbus_2.0.3.bb' failed

I would very much appreciate it in case someone could let me know a solution to build libmodbus using 'bitbake'. Thank you very much and have a great day.
                                                      Best Regards,
                                                      JM