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  1. or download this
    ld: library not found for -lidn
    clang: error: linker command failed with exit code 1 (use -v to see in
    +vocation)
    ld: library not found for -lidn
    clang: error: linker command failed with exit code 1 (use -v to see in
    +vocation)
    This module requires GNU Libidn, which could not be found.
    
  2. or download this
    /usr/local/lib/libidn2.0.dylib
    /usr/local/lib/libidn2.a
    ...
    
    /usr/local/include/idna.h -> /usr/local/include/idn2.h
    /usr/local/include/idn2.h
    
  3. or download this
    __test1.c:1:10: fatal error: 'idna.h' file not found
    #include <idna.h>
             ^~~~~~~~