}
  }

  #
  # NOTE: This procedure verifies the combination of language and version
  #       specified by the caller.  The language argument must be one of the
  #       literal strings "eagle", "tcl", or "client".  The version argument
  #       must be one of the literal strings "8.4", "8.5", or "8.6" when the
  #       language is "tcl" -OR- the literal string "1.0" when the language
  #       is "eagle".  When the language is "client", the version match the
  #       major and minor portions of "1.0" and any remaining portions must
  #       be numeric.  The varName argument is the name of a scalar variable
  #       in the context of the immediate caller that will receive a boolean
  #       value indicating if the specified language is actually a reference
  #       to the package downloader client itself.
  #       must be one of the literal strings "8.4", "8.5", "8.6", or "8.7"
  #       when the language is "tcl" -OR- the literal string "1.0" when the
  #       language is "eagle".  When the language is "client", the version
  #       match the major and minor portions of "1.0" and any remaining
  #       portions must be numeric.  The varName argument is the name of a
  #       scalar variable in the context of the immediate caller that will
  #       receive a boolean value indicating if the specified language is
  #       actually a reference to the package downloader client itself.
  #
  # <internal>
  proc verifyLanguageAndVersion { language version varName } {
    if {[string length $varName] > 0} then {
      upvar 1 $varName isClient
    }

    set isClient false

    if {[string length $language] == 0 || $language eq "eagle"} then {
      if {$version ne "1.0"} then {
        error "unsupported Eagle version"
      }
    } elseif {$language eq "tcl"} then {
      if {$version ne "8.4" && $version ne "8.5" && $version ne "8.6"} then {
      if {$version ne "8.4" && $version ne "8.5" && \
          $version ne "8.6" && $version ne "8.7"} then {
        error "unsupported Tcl version"
      }
    } elseif {$language eq "client"} then {
      if {![regexp -- {^1\.0(?:\.\d+){0,2}$} $version]} then {
        error "unsupported client version"
      }

  maybeAddToAutoPath [expr {[isEagle] ? "eagle" : "tcl"}] \
      $persistentRootDirectory

  #
  # NOTE: Provide the package to the interpreter.
  #
  package provide Eagle.Package.Downloader 1.0.9
  package provide Eagle.Package.Downloader 1.0.10
}