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Why can't MEX find a supported compiler in MATLAB R2015b after I upgraded to Xcode 7.0?

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I installed Xcode 7.0 on my Mac and tried to use MEX. I receive the following error at the MATLAB command prompt:
ERROR: >> mex -setupError using mexNo supported compiler or SDK was found. For options, visithttp://www.mathworks.com/support/compilers/R2015a/maci64.html
Why does MATLAB not recognize the Xcode 7.0 installation on my Mac?

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MathWorks Support Team
MathWorks Support Team am 1 Feb. 2021
Bearbeitet: MathWorks Support Team am 17 Feb. 2021
By default, MATLAB R2015b does not detect Xcode 7.x. To add support for Xcode 7.x in MATLAB R2015b, download the files attached to this article. Please follow these instructions to download and install the files (screenshots were taken in Mac OS X 10.10.5 Yosemite):
1) Download the file xcode7_mexopts.zip, which you will find attached to this article. Extract the contents of xcode7_mexopts.zip to your Downloads directory. Extracting the ZIP file will create a directory in Downloads called xcode7_mexopts.
2) Open MATLAB R2015b. Navigate to MATLAB's preference directory by typing the following command in the command window:
>> cd( prefdir );
3) Using MATLAB's "Current Folder" browser, ensure that there are no XML files that begin with "mex_" (e.g. mex_C_maci64.xml). If such files exist, remove them from the preference directory.
4) Navigate to the MATLAB directory. In MATLAB, you can do so by entering the following command at the MATLAB command prompt:
>> cd( fullfile( matlabroot, 'bin', 'maci64', 'mexopts' ) );
5) Back up the original files in the mexopts directory. You can run the following MATLAB commands to back up the files:
>> mkdir mexoptsContentsOLD
>> movefile *.xml mexoptsContentsOLD/
Keep the backup separate from the downloaded files such that you can revert to the backup files if necessary.
6) Replace any files in the mexopts directory with the corresponding files in the Downloads folder, xcode7_mexopts. You can replace the files in MATLAB by entering the following command at the MATLAB command prompt:
>> movefile( '~/Downloads/xcode7_mexopts/*.xml', '.' );
7) Restart MATLAB R2015b. Execute "mex -setup" at the MATLAB command prompt as shown below and verify that MEX detects Xcode 7.0.
>> mex -setup
Alternate Solution:
The SDK needed could be in the Xcode package with the path:
/Applications/XCODE/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk
Please place this in:
/Library/Developer/CommandLineTools/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk 
This should resolve the issue.
If MEX continues to return an error, please contact
.
 

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