LunarDate is a chinese lunar library.
The official web site is:
https://github.com/yetist/lunar-date
You can download the latest lunar-date tarball from the github.com:
https://github.com/yetist/lunar-date/releases
$ meson build --prefix /usr -Ddocs=true -Dintrospection=true -Dvapi=true -Dtests=true
$ ninja -C build/
$ sudo ninja -C build install
Bugs should be reported to the github issue bug tracking system.