Where do I find libc.so.3.0?

Frequently Asked Questions for FreeBSD 2.X : User Applications : Where do I find libc.so.3.0?
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6.2. Where do I find libc.so.3.0?

You are trying to run a package for 2.2/3.x/4.0 on a 2.1.x system. Please take a look at the previous section and get the correct port/package for your system.