}

        incr counter
      }
    }
  }

  #
  # NOTE: This procedure attempts to check for the configured installation of
  #       OpenPGP.  There are no arguments.  Non-zero is returned if OpenPGP
  #       appears to be installed.
  #
  # <public>
  proc probeForOpenPgpInstallation {} {
    global env
    variable openPgpInstalledDirectory
    variable openPgpInstalledFileName

    if {[catch {openPgpMustBeInstalled}] == 0} then {
      return true
    }

    if {[isWindows]} then {
      if {[info exists env(ProgramFiles(x86))]} then {
        set programFiles $env(ProgramFiles\(x86\))
      } elseif {[info exists env(ProgramFiles)]} then {
        set programFiles $env(ProgramFiles)
      } else {
        return false
      }

      set directory [file join $programFiles $openPgpInstalledDirectory]
    } else {
      set directory $openPgpInstalledDirectory
    }

    if {![file isdirectory $directory]} then {
      return false
    }

    set fileName [file join $directory $openPgpInstalledFileName]

    if {[file exists $fileName] && [file isfile $fileName]} then {
      return [addToPath $directory]
    }

    return false
  }

  #
  # NOTE: This procedure attempts to verify that a configured implementation
  #       of OpenPGP is installed locally.  There are no arguments.  Script
  #       errors are raised if any problems are found.  The return value is
  #       undefined.
  #
  # <public>

          writeFile $fileName(2) $metadata(certificate)
        }

        #
        # NOTE: Attempt to verify the OpenPGP signature for the package
        #       script.
        #
        probeForOpenPgpInstallation
        openPgpMustBeInstalled

        if {[verifyOpenPgpSignature $fileName(2)]} then {
          #
          # NOTE: Delete the temporary files that we created for the
          #       OpenPGP signature verification.
          #

      if {![isEagle] && \
          [llength [package versions Garuda]] > 0} then {
        set autoRequireGaruda true
      } else {
        set autoRequireGaruda false
      }
    }

    #
    # NOTE: This is the name of the sub-directory containing the OpenPGP
    #       implementation.  It is platform-specific.  On Windows, this
    #       sub-directory is relative to the "Program Files" directory.
    #
    variable openPgpInstalledDirectory; # DEFAULT: [file join GNU GnuPG]

    if {![info exists openPgpInstalledDirectory]} then {
      if {[isWindows]} then {
        set openPgpInstalledDirectory [file join GNU GnuPG]
      } else {
        set openPgpInstalledDirectory [file join / usr bin]
      }
    }

    #
    # NOTE: This is the name of the executable file used to invoke the
    #       OpenPGP implementation, without an extension.
    #
    variable openPgpInstalledFileName; # DEFAULT: gpg2

    if {![info exists openPgpInstalledFileName]} then {
      set openPgpInstalledFileName gpg2
    }

    #
    # NOTE: The command to use when attempting to import an OpenPGP key
    #       file.  This must be configured according to the implementation
    #       of OpenPGP in use.
    #
    variable openPgpImportCommand; # DEFAULT: gpg2 --import