libcurl-multi(3) on macOS

The text 6b8d3fcff270, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.

how to use the multi interface

libcurl-multi(3) on macOS now