Once I discovered `lib.fakeSha256`, I just put that in the derivation, try to build it and then use the error message to find the correct hash to put into it. P

Once I discovered `lib.fakeSha256`, I just put that in the derivation, try to build it and then use the error message to find the correct hash to put into it. Probably not the fastest way to do it, but it's easier for me to remember.