0. GNU autotools
1. The "base64" utility from GNU coreutils.
2. The "scour" SVG optimizer.
- 3. The "fontforge" program.
+ 3. The "fontforge" program, built with woff2 support.
4. The "xsltproc" program from libxslt.
To run the test suite, you'll also need the "tidy-html5" program.