Lua's ffi.load("library") results in a cannot open shared object file: No such file or directory error.
As a temporary solution I can provide the absolute or relative path to the library.
Eg. ffi.load("./liblibrary.so").
I've read that LUA_PATH and LUA_CPATH need to be set.
Eg:
export LUA_PATH="$PWD/src/?.lua"
export LUA_CPATH="$PWD/lib/?.so"
Setting LUA_PATH enables me to "require" lua files from other directories, but LUA_CPATH doesn't seem to help with loading shared objects.
ffi.load uses the normal dlopen mechanism of your operating system.
On Linux, this means that you need to add your libraries path to the LD_LIBRARY_PATH variable.
Once LD_LIBRARY_PATH is set, Lua is able to find the library.
I found this answer helped me debug my situation by printing any matching libraries on LD_LIBRARY_PATH.