I performed a 'do-release-upgrade' today, and then tried to compile and link my project. Compilation went normally, but in linking it could not find libudev.so.0 and I could find nothing like that in /lib, /usr/lib or /usr/local/lib. I did 'sudo apt-get install libudev1' and sudo apt-get install libudev-dev' but that did not change the situation at all. Where did this go, and how can I get it back? By the way, the message from gcc says
(try using -rpath or -rpath-link)
This results in a 'not found' error. The term 'rpath' is not found in 'man gcc'.
update: The problem has been mysteriously fixed by installing the latest libusb (version libusb-1.0.19, from the tarball). The link command finds libudev.so.1 in lib/i386-linux-gnu/.