Upstream sources (unmodified tarballs, checksums in build/wasm.sh):
https://downloads.sourceforge.net/project/libwps/libwps/libwps-0.4.14/libwps-0.4.14.tar.xz
https://downloads.sourceforge.net/project/libmwaw/libmwaw/libmwaw-0.3.23/libmwaw-0.3.23.tar.xz
https://dev-www.libreoffice.org/src/libwpd-0.10.3.tar.xz
https://dev-www.libreoffice.org/src/libwpg-0.3.4.tar.xz
https://dev-www.libreoffice.org/src/librevenge-0.0.6.tar.bz2
https://zlib.net/zlib-1.3.2.tar.gz
https://archives.boost.io/release/1.86.0/source/boost_1_86_0.tar.bz2

libwps, libmwaw, libwpd, libwpg and librevenge: Mozilla Public License 2.0 (also LGPL-2.1+). Our files in build/glue: MPL-2.0.
