python.include setting?

[Jeremy Lavergne]

> That's what I was guessing, too.  Here's my first cut at the changes
> ("svn diff" of python-1.0 PortGroup):
> {{{
> Index: python-1.0.tcl
> ===================================================================
> --- python-1.0.tcl      (revision 105062)
> +++ python-1.0.tcl      (working copy)
> @@ -200,7 +200,7 @@
> default python.lib  {[python_get_defaults lib]}
> default python.pkgd {[python_get_defaults pkgd]}
> default python.libdir {${python.prefix}/lib/python${python.branch}}
> -default python.include 
> {${python.prefix}/include/python${python.branch}}
> +default python.include  {[python_get_defaults include]}
> 
> default build.cmd       {"${python.bin} setup.py [python_get_defaults
> setup_args]"}
> default destroot.cmd    {"${python.bin} setup.py [python_get_defaults
> setup_args]"}
> @@ -227,6 +227,24 @@
>                 return "${prefix}/bin/python${python.branch}"
>             }
>         }
> +        include {
> +            set ret "${python.prefix}/include/python${python.branch}"
> +            if {[file exists ${ret}]} {
> +                return ${ret}
> +            } else {
> +                # look for "${ret}*" and pick the first one found;
> +                # make assumptions if none are found
> +                if {[catch {set dirs [glob ${ret}*]}]} {
> +                    if {${python.version} < 30} {
> +                        return ${ret}
> +                    } else {
> +                        return ${ret}m
> +                    }
> +                } else {
> +                    return [lindex ${dirs} 0]
> +                }
> +            }
> +        }
>         lib {
>             if {${python.version} != 24 && ${python.version} != 25} {
>                 return "${python.prefix}/Python"
> }}}

Here's goes my rusty Tcl-ese: we're doing a glob for pythonX.Y*, which is good. But why the nested if/then? Either we found something or didn't.