To build:

ligo compile-contract -s cameligo whitelist_contract.ligo.ml whitelist_contract

Note: The extension .ligo.ml is used so that other tools will recognize the syntax.

Built with:

❯❯❯ ligo --version
Rolling release
Hash: cc83aa136773212e38fa49d3437d53c49a9b1b6d
Date: 2020-03-05 15:38:09 +0000
CI job id: 460994609