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Build a Third Party Library

Level 2
I have a Unity project with an external library (Eigen) that can be built separately as DLL.
I'm trying to include the DLL building it with arm64 toolchain, but I get this error when I test the app:

Unable to load library '/data/app/com.DefaultCompany.myAPP/lib/arm64/', native render plugin support disabled: java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/com.DefaultCompany.myAPP/lib/arm64/" has unexpected e_machine: 62
10-03 16:02:02.636  3963  3978 E Unity   : Unable to find Eigen
10-03 16:02:02.652  3963  3978 E Unity   : DllNotFoundException: Unable to load DLL 'Eigen': The specified module could not be found.

It looks a problem of the ELF, but I'm not an expert. Do you know how I should build an external library under linux that needs to be included in a Unity project?  (I follow this for the ARM64