# Using Yakut monitor on Raspberry Pi compute module 4 **URL:** \ **Category:** CLI tools (Cynic/Yakut)\ **Created:** [August 19, 2021, 12:49pm UTC](https://forum.opencyphal.org/t/using-yakut-monitor-on-raspberry-pi-compute-module-4/1399 "2021-08-19T12:49:38Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![rebeccaRossRobotics](https://forum.opencyphal.org/user_avatar/forum.opencyphal.org/rebeccarossrobotics/32/1387_2.png) [@rebeccaRossRobotics](https://forum.opencyphal.org/u/rebeccaRossRobotics)\ **Post date:** [August 19, 2021, 12:49pm UTC](https://forum.opencyphal.org/t/using-yakut-monitor-on-raspberry-pi-compute-module-4/1399/1 "2021-08-19T12:49:38Z")
Hi, I’m currently trying to install yakut onto a raspberry pi compute module 4. I’ve followed the install instructions found [here](https://forum.opencyphal.org/t/screencast-of-installing-configuring-yakut/1197), however when i try to run yakut moniter i get the following error: OSError: /usr/local/lib/python3.8/dist-packages/libpcap/\_platform/\_linux/x64/tcpdump/libpcap.so: cannot open shared object file: No such file or directory The full output with verbose is this: ```auto File "/usr/local/bin/yakut", line 8, in sys.exit(main()) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 829, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 782, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 1259, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 610, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/click/decorators.py", line 73, in new_func return ctx.invoke(f, obj, *args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/click/core.py", line 610, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/yakut/main.py", line 209, in proxy return loop.run_until_complete(f(*args, **kwargs)) File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete return future.result() File "/usr/local/lib/python3.8/dist-packages/yakut/cmd/monitor/_cmd.py", line 132, in monitor iface = Iface(node) File "/usr/local/lib/python3.8/dist-packages/yakut/cmd/monitor/_iface.py", line 30, in __init__ node.presentation.transport.begin_capture(self._process_capture) File "/usr/local/lib/python3.8/dist-packages/pyuavcan/transport/udp/_udp.py", line 292, in begin_capture self._sniffer = self._sock_factory.make_sniffer(self._process_capture) File "/usr/local/lib/python3.8/dist-packages/pyuavcan/transport/udp/_ip/_v4.py", line 142, in make_sniffer return SnifferIPv4(self._local, handler) File "/usr/local/lib/python3.8/dist-packages/pyuavcan/transport/udp/_ip/_v4.py", line 151, in __init__ self._link_layer = LinkLayerSniffer(filter_expression, handler) File "/usr/local/lib/python3.8/dist-packages/pyuavcan/transport/udp/_ip/_link_layer.py", line 122, in __init__ dev_names = _find_devices() File "/usr/local/lib/python3.8/dist-packages/pyuavcan/transport/udp/_ip/_link_layer.py", line 341, in _find_devices import libpcap as pcap File "/usr/local/lib/python3.8/dist-packages/libpcap/ __init__.py", line 7, in from ._pcap import * ; del _pcap # noqa File "/usr/local/lib/python3.8/dist-packages/libpcap/_pcap.py", line 73, in from ._dll import dll File "/usr/local/lib/python3.8/dist-packages/libpcap/_dll.py", line 10, in raise exc File "/usr/local/lib/python3.8/dist-packages/libpcap/_dll.py", line 8, in dll = DLL(DLL_PATH) File "/usr/lib/python3.8/ctypes/ __init__.py", line 373, in __init__ self._handle = _dlopen(self._name, mode) OSError: /usr/local/lib/python3.8/dist-packages/libpcap/_platform/_linux/x64/tcpdump/libpcap.so: cannot open shared object file: No such file or directory ``` Does anyone know how to fix this? Thanks ---
**Author:** ![pavel.kirienko](https://forum.opencyphal.org/user_avatar/forum.opencyphal.org/pavel.kirienko/32/9_2.png) [@pavel.kirienko](https://forum.opencyphal.org/u/pavel.kirienko)\ **Post date:** [August 20, 2021, 2:43pm UTC](https://forum.opencyphal.org/t/using-yakut-monitor-on-raspberry-pi-compute-module-4/1399/2 "2021-08-20T14:43:58Z")
I see that you are using the UAVCAN/UDP transport, that’s cool. Yakut is built on top of PyUAVCAN, which has an optional dependency on libpcap if the UAVCAN/UDP transport is needed: > The sources of the libpcap wrapper are here: [https://github.com/karpierz/libpcap](https://github.com/karpierz/libpcap). It comes with prebuilt native libraries for some of the platforms, including GNU/Linux x86/x86\_64, Windows, and macOS. Prebuilt libraries for ARM-based platforms are not included, for which you have two solutions: - **Quick and dirty:** install the native libpcap for your platform and symlink `libpcap.so` from the path referenced in your original post. - **Proper:** send a pull request against the libpcap wrapper adding support for your platform, or modify the wrapper to search for the libpcap binary in the standard lib paths for the system. ---
**Author:** ![rebeccaRossRobotics](https://forum.opencyphal.org/user_avatar/forum.opencyphal.org/rebeccarossrobotics/32/1387_2.png) [@rebeccaRossRobotics](https://forum.opencyphal.org/u/rebeccaRossRobotics)\ **Post date:** [August 23, 2021, 10:59am UTC](https://forum.opencyphal.org/t/using-yakut-monitor-on-raspberry-pi-compute-module-4/1399/3 "2021-08-23T10:59:26Z")
Thanks very much! all working now!! Just incase anyone else has this issue and want’s to know what i did to fix this I followed this link: [https://stackoverflow.com/questions/59507388/cross-compile-libpcap-dev-aarch64](https://stackoverflow.com/questions/59507388/cross-compile-libpcap-dev-aarch64) And then deleted the libpcap.so file at the location “/usr/local/lib/python3.8/dist-packages/libpcap/\_platform/\_linux/x64/tcpdump” At that same location i created a symlink to the libpcap.so file compiled with this command: ln -s /usr/lib/aarch64-linux-gnu/libpcap.so libpcap.so