Warning: Xcode appears to be installed but xcodebuild is unusable; some ports will likely fail to build

[René Fournier]

I tried upgrading outdated ports, and got the above error message. (It's always worked before.) Anyway, I did the xcode-select thing, and still, no dice. Anyone else experience this?
(Mac OS X 10.7.4, Xcode 4.3.2). Here's the output:

Sat May 12 08:29:21 -- Me ~ :: sudo port upgrade outdated;
Password:
Warning: Xcode appears to be installed but xcodebuild is unusable; some ports will likely fail to build.
Warning: You may need to run `sudo xcode-select -switch /Applications/Xcode.app`
--->  Computing dependencies for ImageMagick
--->  Fetching ImageMagick
--->  Attempting to fetch ImageMagick-6.7.6-7.tar.xz from http://image_magick.veidrodis.com/image_magick/
^CSat May 12 08:29:38 -- Me ~ :: sudo xcode-select -switch /Applications/Xcode.app
Sat May 12 08:29:42 -- Me ~ :: sudo port upgrade outdated;
Warning: Xcode appears to be installed but xcodebuild is unusable; some ports will likely fail to build.
Warning: You may need to run `sudo xcode-select -switch /Applications/Xcode.app`
--->  Computing dependencies for ImageMagick
--->  Fetching ImageMagick
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