>Yes, The OS is very old "SunOS 4.1.4". Is the problem due to old OS..?
>Do i need new OS...?

wow.  well, i suppose i get points for guessing.  :)

i'm afraid you'll need something a little newer than that to
cross-build netbsd.  the cross-build stuff works marvelously, but you
have to give it a bit more of a leg to stand on in order to allow it
to launch itself into orbit.

do you have spare disks you could plug into that sparc?  you could
install a relatively recent netbsd/sparc snapshot onto something and
boot that in order to do the cross-compile much more easily...

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