t.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

Debian 9.

There's a problem with a referred library in the xcb plugin:

ans@rhialto:~/Qt/Tools/QtCreator/bin$ ldd /home/hans/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep -i found
libxcb-util.so.1 => not found
libxcb-util.so.1 => not found

Installed:

root@rhialto:~# find /usr/lib -name 'xcb-util' -exec ls -l {} \;
rw-rr- 1 root root 249 aug 26 2014 /usr/lib/x86_64-linux-gnu/pkgconfig/xcb-util.pc
lrwxrwxrwx 1 root root 20 aug 26 2014 /usr/lib/x86_64-linux-gnu/libxcb-util.so.0 -> libxcb-util.so.0.0.0
lrwxrwxrwx 1 root root 20 aug 26 2014 /usr/lib/x86_64-linux-gnu/libxcb-util.so -> libxcb-util.so.0.0.0
rw-rr- 1 root root 26936 aug 26 2014 /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0
rw-rr- 1 root root 26682 aug 26 2014 /usr/lib/x86_64-linux-gnu/libxcb-util.a

root@rhialto:~# aptitude search libxcb-util
i A libxcb-util0 - utility libraries for X C Binding – atom, aux and event
i libxcb-util0-dev - utility libraries for X C Binding – atom, aux and event
root@rhialto:~#