Hello! 

I have been using the Dealii installation through the .dmg file on my 
MacOSX (MacBook Pro, Apple M1 chip, OSX 26.4 Tahoe, and DealII version 
9.7.1). Everything was working fine until I updated my OS from 26.3 Tahoe 
to 26.4, at which point I could not even run the example codes. For 
instance, if I cd into the step-1 folder, run cmake ., and then make, I get 
the errors:

*/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.4.sdk/usr/include/c++/v1/cstdio:107:5:
 
**error: *

*      <cstdio> tried including <stdio.h> but didn't find libc++'s 
<stdio.h>*

*      header. This usually means that your header search paths are not*

*      configured properly. The header search paths should contain the C++*

*      Standard Library headers before any C Standard Library, and you are*

*      probably using compiler flags that make that not be the case.*

  107 | #   error <cstdio> tried including <stdio.h> but didn't find libc++'s 
<s...

*/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.4.sdk/usr/include/c++/v1/cmath:571:15:
 
**error: *

*      expected unqualified-id*

  571 |   return std::isinf(__lcpp_x);

I've tried completely deleting and reinstalling the DMG, uninstalling and 
reinstalling the Xcode tools, and also using the Candi installation instead 
(which produces essentially the same error during the "make" step of the 
Dealii installation. Does this mean it is necessary for me to reinstall 
Dealii by source instead of using the DMG file?

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