Most likely, your adesklets installment or one of its
dependencies (Imlib2 or fontconfig) was built against an
older version of Xorg (< 6.9.x).
Solution is simply to upgrade the problematic X11-related
library(ies), and possibly (re)compiling adesklets from
source. You can use
ldd
(part of glibc) to investigate things further if you want to
pinpoint exacly what component is failing:
ldd `which adesklets` | sed -n '/=>/{s/.*=>\(.*\)(.*/\1/;p}' | xargs --max-lines=1 ldd
I hope this helps. Yours,