Hello,
I do not pretend to understand anything about Lua, but
filters/email-gravatar.lua contains
local digest = require("openssl.digest")which apparently means to open the digest file in the openssl directory. I installed https://github.com/zhaozg/lua-openssl which recommends the syntax: local digest = require'openssl'.digest and that latter syntax does work. This change is likely also good for the other lua-cgit-filters, which I do not use. Greetings Дилян
