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Cross-compiling is always tricky. It looks like in your case CMake finds your native AMD64 libraries instead of the ARM ones. You probably need to create a CMake Toolchain file if your toolchain does not come with one tell CMake to use it using -DCMAKE_TOOLCHAIN_FILE=... - see https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling for details. Note that CMake does not really support changing the toolchain that well so make sure you start from a clean build directory.

For our Linux cross builds I use this toolchain file: https://github.com/arx/ArxBuild/blob/master/toolchains/cross-toolchain.cmake It makes many assumptions like getting the target triple from the (symlinked) filename and expecting the cross root at "/usr/${target}" so you will probably need to adapt it. The most important part is setting the CMAKE_SYSROOT and CMAKE_FIND_* variables to tell CMake where to look as well as the PKG_CONFIG_LIBDIR and PKG_CONFIG_SYSROOT_DIR environment variables to do the same for pkgconfig which CMake will use for many libraries.