SDK check

I'm in the process of making some modifications to fink to use tests
which are more Xcode-version-independent (as well as allowing for
Xcode 4.3 not to have to sit only in /Applications).  I found
something a little weird (to me, anyway) in the MacOSX SDK check
portion of VirtPackages.pm:

=item "system-sdk-*"

These packages represent the SDKs available in /Developer/SDKs, available
as part of the Xcode tools.

=cut

	my @SDKDIRS = qw(
		MacOSX10.0.0.sdk
		MacOSX10.1.0.sdk
		MacOSX10.2.0.sdk
		MacOSX10.3.0.sdk
		MacOSX10.3.9.sdk
		MacOSX10.4.0.sdk
		MacOSX10.4u.sdk
	);

	if (opendir(DIR, '/Developer/SDKs')) {
		push(@SDKDIRS, grep(/MacOSX.*.sdk/, readdir(DIR)));
		closedir DIR;
	}

It seems kind of strange to have the list of defaults and then to push
the actual installed SDKs onto that, in particular since the defaults
seem archaic.  Do we currently need to display anything earlier than
10.3.9, since Xcode for 10.5 doesn't come with anything earlier?

For that matter, should we display SDKs that aren't even available for
the OS X version in question?  Right now, with fink-0.32.3, on Lion
(with Xcode 4.3) we show:

$ fink list -t sdk
Scanning package description files..........
Information about 4460 packages read in 1 seconds.
   	system-sdk-10.0	10.0.0-1	[virtual package representing the Mac OS
X 10.0 SDK]
   	system-sdk-10.1	10.1.0-1	[virtual package representing the Mac OS
X 10.1 SDK]
   	system-sdk-10.2	10.2.0-1	[virtual package representing the Mac OS
X 10.2 SDK]
   	system-sdk-10.3	10.3.9-1	[virtual package representing the Mac OS
X 10.3 SDK]
   	system-sdk-10.4	10.4.0-1	[virtual package representing the Mac OS
X 10.4 SDK]
   	system-sdk-10.4-universal	10.4-1	[virtual package representing the
Mac OS X 10.4 Universal SDK]

They show as not installed, which is true, but I think they shouldn't
even show up at all.  (The 10.6 and 10.7 SDKs don't show up here
because of the changed SDK path for Xcode 4.3)

I'd propose having only displaying SDKs that are available for a
particular Xcode, (e.g. 10.3.9, 10.4u, 10.5 for Xcode 3.0 or 3.1;
10.6, 10.7 for 4.x).

Any thoughts?
-- 
Alexander K. Hansen
akh AT finkproject DOT org
Fink User Liaison and Documenter

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