I did a fresh installation of freetds & sybperl using freetds, unless it wont generate DBlib.so, its something to do with teh library paths, which is done by Dynaloader.pm module

I googled and found that Dynlaoader.pm loads libraries from default lib paths and then looks @ $LD_LIBRARY_PATH for any new libraries, due to which my DBlib library is probably not referenced.