PHP Fatal error: .../vendor/autoload.php: No such file

by jernst, Thursday, June 01, 2017, 20:56 (2198 days ago)

Getting a Fatal error with Version 2.17:

PHP Fatal error: require(): Failed opening required '.../selfoss/vendor/autoload.php' (include_path='.:') in .../selfoss/common.php on line 7

The require statement in common.php is unconditional:

require __DIR__ . '/vendor/autoload.php';

However, nowhere in the codebase do I find a file named autoload.php or a directory named vendor. Also, I cannot find a reference to either in installation instructions.

What am I missing?