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Hi,

A ROOT user [reports](https://root-forum.cern.ch/t/compile-root-with-apple-m1max/48664):

```
In file included from /Users/xin/onedrive/program/physics/tools/rootmax/XROOTD-prefix/src/XROOTD/src/XrdNet/XrdNetIF.cc:48:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/iostream:37:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/ios:215:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/__locale:15:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/string:511:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/string_view:179:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/__string:57:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/algorithm:653:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/memory:673:
/Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/new:319:5: error: expected unqualified-id
  ::posix_memalign(&__result, __alignment, __size);
    ^
/Users/xin/onedrive/program/physics/tools/rootmax/XROOTD-prefix/src/XROOTD/src/./XrdSys/XrdSysPlatform.hh:126:9: note: expanded from macro 'posix_memalign'
        ((*memp = memalign(algn, sz)) ? 0 : ENOMEM)
        ^
```

It seems - courageous to `#define` `posix_memalign` if the stdlib is using it itself?

Cheers, Axel


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