Solidity Tutorial – How to Include One Solidity File into Another

I completely stuck on modules importing into Solidity contract. Here is my files/directory layout:

.
|-> contracts/
  |-> contract1.sol
  |-> contract2.sol

File contract1.sol contains only pragma and import statements like:

pragma solidity ^0.4.0;
import "./contract2" as c2;

File contract2.sol conntains only pragma statement:

pragma solidity ^0.4.0;

Then I open node shell and input following code:

> solc = require('solc')
> solc.compile(fs.readFileSync('contracts/contract1.sol').toString())
{ contracts: {},
  errors: [ ':3:1: ParserError: Source "contract2" not found: File not supplied initially.\nimport "./contract2" as c2;\n^-------------------------^\n' ],
  sourceList: [ '' ],
  sources: {} }

I already tried to:

• specify full path in contract1.sol
• add extension .sol
• remove ./contracts/ prefix and run commands inside contracts folder.

Nothing works. Accordingly to this article begin import with dot and slash is enough but, damn, no!

How to include one sol file into another?
Node version is 8.1.13, solcjs version is 0.4.13+commit.0fb4cb1a.Emscripten.clang