issue when building atomic asset contract in eos studio

[regtable]

i have set up my eos studio to work with the wax testnets and have tried to build the zip file from main page here
i am using

the error i get when it builds is this
error: else expression without matching if
0000bd7: error: OnElseExpr callback failed
however it still builds and then gives the same error when i come to deploy it to my testnet account.
i am trying to see if i can get the contract on my acc so i can mint a few on demand assets easier then how i have tried in the past.

thanks for the help. there is no other errors available for some reason

[imb590]

This rather unhelpful error message is seemingly due to the bug in the 1.6.1 compiler version: EOSIO/eosio.cdt#497. Use another version, I was able to build a deployable and looking-like-it's-working binary for this contract with 1.7.0.

What I do not understand is why this repository does not contain any build scripts or even instructions on how to build the contract. What is deployed on the blockchains, how exactly it was produced from the source code - it's a mystery.