```
make check-devtools
ninja check-devtools
show help message
make_chainparams.py --help
errors due to missing config/config params
make_chainparams.py -c blah
make_chainparams.py
vim ~/.bitcoin/bitcoin.conf # add rpcuser
make_chainparams.py
vim ~/.bitcoin/bitcoin.conf # add rpcpassword
generates mainnet output
bitcoind
make_chainparams.py
generates testnet output
bitcoind --testnet
make_chainparams.py -a "127.0.0.1:18332"
```