I've tried a number of options, none of which allow specifying multiple solc-paths: `... --solc-paths="a=b,c=d"` `... --solc-paths="a=b;c=d"` `... --solc-paths="'a=b''c=d'"` `... --solc-paths="a=b c=d"` `... --solc-paths="a=b" --solc-paths="c=d"` (gets overriden) Better documentation or enabling this feature would help, since solidity itself does support them.