If you are on 32-bit and want to try the extension, do this:
$ wget http://repo.tinycorelinux.net/13.x/x86_64/tcz/openresolv.tcz
The extension does not have dependencies, so just copy the downloaded openresolv.tcz to your tce/optional/ directory. Then add the extension's name (openresolv.tcz) to tce/onboot.lst and reboot.
It is almost impossible to break a TCL system. If the extension doesn't work for you, just remove the extension from tce/optional/ , remove its name from tce/onboot.lst , and reboot. You'll be right back where you started

[EDIT]: Edited first line as requested by GNUser. Rich