This document describes how libcmark-gfm-extensions was packaged for build2.
In particular, this understanding will be useful when upgrading to a new
upstream version. See ../README-DEV for general notes on cmark-gfm packaging.

Symlink the required upstream files and directories into
libcmark-gfm-extensions/:

$ ln -s ../../upstream/extensions libcmark-gfm-extensions

Create cmark-gfm-extensions_export.h defining CMARK_GFM_EXTENSIONS_EXPORT
macro.