reg:GNUradio build - gr-trellis module

Dear All,
I have been facing some problem with the gr-trellis module
during the make of a Full GNUradio build with the version 3.0. Hence I
recently updated to the 3.02 version and tried to make a full build but
ended up with the same problem on gr-trellis.
make[4]: Leaving directory /cygdrive/c/gnuradio/gr-trellis/src/lib' Making all in python make[4]: Entering directory/cygdrive/c/gnuradio/gr-trellis/src/python’
make[4]: Nothing to be done for all'. make[4]: Leaving directory/cygdrive/c/gnuradio/gr-trellis/src/python’
make[4]: Entering directory /cygdrive/c/gnuradio/gr-trellis/src' make[4]: Nothing to be done forall-am’.
make[4]: Leaving directory /cygdrive/c/gnuradio/gr-trellis/src' make[3]: Leaving directory/cygdrive/c/gnuradio/gr-trellis/src’
Making all in doc
make[3]: Entering directory /cygdrive/c/gnuradio/gr-trellis/doc' xmlto html-nochunks gr-trellis.xml xmlto: input does not validate (status 3) error : Operation in progress /cygdrive/c/gnuradio/gr-trellis/doc/gr-trellis.xml:6: warning: failed to load ex ternal entity "/cygdrive/c/gnuradio/gr-trellis/doc/docbookx.dtd" ]> ^ error : Operation in progress warning: failed to load external entity "/cygdrive/c/gnuradio/gr-trellis/doc/doc bookx.dtd" Could not load the external subset "docbookx.dtd" Document /cygdrive/c/gnuradio/gr-trellis/doc/gr-trellis.xml does not validate make[3]: *** [gr-trellis.html] Error 3 make[3]: Leaving directory/cygdrive/c/gnuradio/gr-trellis/doc’
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory /cygdrive/c/gnuradio/gr-trellis' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory/cygdrive/c/gnuradio’
make: *** [all] Error 2

The problem seems to me with some xml file…and it has got me stumped.
I would be really greatful if anyone could sort it out.

Thanks

Shriram K V