$ ./sguil.tk 
ERROR: The tcllib_dns package version 1.3.1 or higher is requred.
The tcllib_dns package is part of the tcllib extension. More information
is available at http://tcllib.sourceforge.net

can't find package dns 1.3.1
Error in startup script: invalid command name "CleanExit"
    while executing
"CleanExit"
    invoked from within
"if [catch {package require dns 1.3.1} dnsVersion] {
    puts "ERROR: The tcllib_dns package version 1.3.1 or higher is requred."
    puts "The tcllib_..."
    (file "./sguil.tk" line 46)