If you've arrived at CPAN now trying to compile DBD::Sybase, please post the FULL console output instead of some grotesquely shortened output. Especially relevant are the output of perl -w Makefile.PL if you ran it yourself.
In the bug list for DBD::Sybase, there are lots of bugs (and some fixes) for compiling under Windows. Have you investigated these already?
Ideally, you run the whole configuration and compilation manually:
cpan
CPAN> look DBD::Sybase
... DBD-Sybase-1.2345> perl Makefile.PL
...
... DBD-Sybase-1.2345> nmake
Somewhere there, the error should occur, and for diagnosis, we need the complete session starting from look DBD::Sybase.