Currently the libcurl .so is shipped in the library archive as it is not present on some systems, but its dependencies are not being shipped correctly.
Options:
Stop shipping libcurl and expect it as a system dependency. On Steam eventually this should not be an issue as it is part of the runtime.
Build KAG against a static build of libcurl (custom-built or not).
Painfully through all dependencies of libcurl and ship them as well.
Currently the libcurl .so is shipped in the library archive as it is not present on some systems, but its dependencies are not being shipped correctly.
Options: