g++-12

Since installing Sequoia and the new Xcode I can no longer compile with g++-12. I get a very long list of compiler errors, starting with:

In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_wchar.h:90,
                 from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/wchar.h:67,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/cwchar:44,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/bits/postypes.h:40,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/iosfwd:40,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/ios:38,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/ostream:38,
                 from /opt/sw2/lib/gcc12/include/c++/12.2.0/iostream:39,
                 from SU3pg4dMC.cpp:4:
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:81:8: error: ‘FILE’ does not name a type
   81 | extern FILE *__stdinp;
      |        ^~~~
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:79:1: note: ‘FILE’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
   78 | #include <_stdio.h>
  +++ |+#include <cstdio>
   79 |
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:82:8: error: ‘FILE’ does not name a type
   82 | extern FILE *__stdoutp;
      |        ^~~~
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:82:8: note: ‘FILE’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:83:8: error: ‘FILE’ does not name a type
   83 | extern FILE *__stderrp;
      |        ^~~~
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:83:8: note: ‘FILE’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:156:10: error: variable or field ‘clearerr’ declared void
  156 | void     clearerr(FILE *);
      |          ^~~~~~~~
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:156:19: error: ‘FILE’ was not declared in this scope
  156 | void     clearerr(FILE *);
      |                   ^~~~
/opt/sw2/lib/gcc12/lib/gcc/x86_64-apple-darwin22.6.0/12.2.0/include-fixed/stdio.h:156:19: note: ‘FILE’ is defined in header ‘<

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