Are you missing a linker flag, i.e. -ludev, or did you forget to include
libudev.h?
If it's not either of those, please provide some more information such
as your current Ubuntu release, and what version of libudev-dev is
installed on your system:
$ apt-cache policy libudev-dev
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1990315
Title:
cannot link against libudev
Status in systemd package in Ubuntu:
Incomplete
Bug description:
When building Mesa vulkan drivers I get a lot of those error messages
and the build fails:
```
error: undefined symbol: udev_new
error: undefined symbol: udev_monitor_get_fd
error: undefined symbol: udev_monitor_new_from_netlink
error: undefined symbol: udev_monitor_receive_device
error: undefined symbol: udev_monitor_unref
error: undefined symbol: udev_unref
error: undefined symbol: udev_device_unref
error: undefined symbol: udev_device_get_property_value
error: undefined symbol: udev_monitor_filter_add_match_subsystem_devtype
error: undefined symbol: udev_monitor_enable_receiving
```
It worked on Ubuntu 21.10.
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