setting a variable in a variant for later use

[Jonathan Stickel]

I am trying to set a variable in a variant for later use in another 
variant, but I am getting errors that the variable does not exist. Here 
are the relevant lines:


variant python26 conflicts python27 description {Configure to use Python 
version 2.6} {
     set python.version 26
}
variant python27 conflicts python26 description {Configure to use Python 
version 2.7} {
     set python.version 27
}

if { ![variant_isset python26] } {
	default_variants      +python27
}

variant tkinter description {use py-tkinter backend} {
     depends_lib-append  port:py${python.version}-tkinter
}
variant pygtk description {use py-gtk backend} {
     depends_lib-append  port:py${python.version}-gtk
}

default_variants-append    +pygtk


When I do a portindex, I get:

Error: inkscape-textext: Error executing pygtk: can't read 
"python.version": no such variable

I suppose I could nest the variants somehow, but that seems messy. Any 
suggestions about how to handle this cleanly?

Thanks,
Jonathan