Package: usbguard Version: 0.7.4+ds-1 The current build triggers those warnings https://buildd.debian.org/status/fetch.php?pkg=usbguard&arch=amd64&ver=0.7.4%2Bds-1%2Bb1&stamp=1546507610&raw=0
dpkg-shlibdeps: warning: debian/libusbguard0/usr/lib/x86_64-linux-gnu/usbguard/libusbguard.so.0.0.0 contains an unresolvable reference to symbol pthread_create: it's probably a plugin dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libusbguard0/usr/lib/x86_64-linux-gnu/usbguard/libusbguard.so.0.0.0 was not linked against libdl.so.2 (it uses none of the library's symbols) dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/usbguard/usr/sbin/usbguard-dbus was not linked against libdbus-glib-1.so.2 (it uses none of the library's symbols) dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/usbguard/usr/sbin/usbguard-dbus was not linked against libgobject-2.0.so.0 (it uses none of the library's symbols) dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/usbguard/usr/sbin/usbguard-dbus was not linked against libdbus-1.so.3 (it uses none of the library's symbols) The unresolvable reference looks like it might be worth looking at? Cheers,

