Configure error with XCode 4.3 / Mac OSX 10.7

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What is the expected behavior? What do you see instead?
Successful configure. Failed with build errors.
-isysroot is given an empty value as apparently the SDK path has changed with 
4.3:
 osx_sdk_dir="/Applications/Xcode.app/Contents/Developer/Platforms/ 
 MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk"

Two things should be done:
1) the path corrected.
2) an error if osx_sdk_dir is empty.

What version are you using? On what operating system?
Mac OSX 10.7 / XCode 4.3

Can you reproduce using the vpxdec or vpxenc tools? What command line are
you using?

Please provide any additional information below.
Original thread:
https://groups.google.com/a/webmproject.org/group/webm-discuss/browse_thread/thr
ead/419eb0c7d519f1c5#

Original issue reported on code.google.com by jz...@chromium.org on 21 Feb 2012 at 6:33

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Original comment by jz...@google.com on 21 Feb 2012 at 7:11

• Changed state: Available

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https://gerrit.chromium.org/gerrit/#change,16316

Original comment by jz...@google.com on 21 Feb 2012 at 11:18

• Changed state: Accepted

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Original comment by albe...@google.com on 8 Mar 2012 at 12:08

• Added labels: Pri-2, Type-Bug
• Removed labels: Priority-Medium, Type-Defect

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Original comment by albe...@google.com on 8 Mar 2012 at 12:26

• Changed state: Assigned