title: expint c++ method om Macos M1
body: <p>i tried run method <strong>expint</strong> from cmath and got error, i used c++17, c++17 should support this method but it doesn't see it. C++ version Apple clang version 13.1.6 (clang-1316.0.21.2). which version should I use so that the expint method is available?</p>
  <pre><code>//#define __STDCPP_WANT_MATH_SPEC_FUNCS__ 1
  //#define __STDCPP_MATH_SPEC_FUNCS__ 201003L
  
  #include &lt;cmath&gt;
  #include &lt;iostream&gt;
  
  int main(int argc, const char * argv[]) {
      std::cout &lt;&lt; &quot;Hello, World!\n&quot;;
      
      std::expint(10.4);
      return 0;
  }
  </code></pre>
  <p><a href="https://en.cppreference.com/w/cpp/experimental/special_functions/expint" rel="nofollow noreferrer">expint docs</a> <a href="https://en.cppreference.com/w/cpp/numeric/special_functions/expint" rel="nofollow noreferrer">one more expint docs</a></p>
  <p>error</p>
  <p><a href="https://i.stack.imgur.com/LND9v.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LND9v.png" alt="error" /></a></p>
  <p>c++ configs
  <a href="https://i.stack.imgur.com/9XMEE.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9XMEE.jpg" alt="c++ configs" /></a></p>