After saying `make refdoc' or `make refdoc-venv' the `reference/' directory contains the FreeType API reference. You need Python >= 3.5 and pip to make this target. There are two ways to generate the documentation: 1. Using `make refdoc': - Ensure `python' and `pip' are available. - Install pip package `docwriter' with `pip install --user docwriter'. - Make target with `make refdoc'. - This target can be run offline once required packages are installed. 2. Using `make refdoc-venv' (requires internet access): - Ensure `python', `pip' and Python package `virtualenv' are available. - Make target with `make refdoc-venv'. - This may or may not require internet access every time depending on pip and system caching. Some troubleshooting tips: * Regularly run `pip install --upgrade docwriter' to check for updates which may include bug fixes. * `Docwriter' does not support Python 2. Ensure that Python >= 3.5 is installed and available as `python3'/`python'. * Ensure that `docwriter' is installed in the same Python target that `make refdoc' uses (python3/python). * If none of this works, send a mail to `freetype-devel@nongnu.org' or file an issue at `https://github.com/freetype/docwriter/issues'.