1if {![package vsatisfies [package provide Tcl] 8.2]} {return} 2package ifneeded cksum 1.1.3 [list source [file join $dir cksum.tcl]] 3package ifneeded crc16 1.1.1 [list source [file join $dir crc16.tcl]] 4package ifneeded crc32 1.3.1 [list source [file join $dir crc32.tcl]] 5package ifneeded sum 1.1.0 [list source [file join $dir sum.tcl]] 6