I just tried to install "dig" in TC Pure64 13, which I found lives in the bind.tcz extension, but I ran into some missing dependencies. The "dig" program required libuv.so.1 from libuv.tcz, and libxml2.so.2 from libxml2.tcz, before it would run. But these aren't in bind.tcz.dep (nor are they in the bind.tcz.dep for the x86 extension, but I haven't checked whether they are required there too).
To be clear, I suggest adding these lines to the x86_64 (and possibly x86) bind.tcz.dep file:
libuv.tcz
libxml2.tcz