Maintenance release.
Brings changes (some of which were bugfixes) for improved compatibility with modern tools: Automake, Autoconf, ImageMagick, libpng, and Clang.
With the new optional build dependency OpenSSL, the generated PDF files will have file identity information, bringing them closer to PDF/A conformance.
Bugfixes include:
- PDF generation (addressing a GhostScript warning).
- A use after free detected by AddressSanitizer.