creates a binary-form dictionary (with extension .cbd or dicname)
from a text-form dictionary textfile. With -c mkbindic creates old
format dictionary. Current supported versions are 3.0 and 3.7.
% mkbindic user.ctd
A binary-form dictionary user.cbd and a frequency dictionary
user.cld are created from a text-form dictionary user.ctd.
mkbindic uses the value of this variable for the working directory
when it makes temporary files. The value defaults to /tmp if not specified.