Comment # 4 on bug 1106850 from Dr. Werner Fink

... and value of the environment variable XMODIFIERS as shown by

   echo $XMODIFIERS

would be very interesting ... also the values of font config environment
variables as shown by

   echo ${!FONTCONFIG_*} ${!FC_*}

which would be something like

   for var in ${!FONTCONFIG_*} ${!FC_*}; do
       eval echo $var=\$$var
   done