Installation is relatively simple: edit Makefile to taste and run 'make install',
which will copy necessary files to appropriate directories. 

The install process copies the file selector widget, fileselector.tcl,
to the Tk library directory, but does not run the auto_mkindex
command; you may run it by hand, or, even better, append these lines
to the tclIndex file from the SRCDIR directory defined in the Makefile
(typically /usr/local/lib/tk):

set auto_index(gp_FileSelectorDialog) "source $dir/fileselector.tcl"
set auto_index(gp_FileSelectorBox) "source $dir/fileselector.tcl"
set auto_index(gp_SingleFileSelectorBox) "source $dir/fileselector.tcl"
set auto_index(gp_SingleFileSelectorDialog) "source $dir/fileselector.tcl"

