title: Why do I get ambiguous errors in Rcpp
body: <p>While I have used macOS 10.14, everything worked fine. Then I updated to macOS 10.15.7, and now when I compile my Cpp code in the R environment, I constantly get the following error:</p>
  <pre><code>call to `exp` is ambiguous 
  </code></pre>
  <p>The same occurs for other functions, such as <code>pow</code>.
  I read that it depends on the input variables; however, I've never experienced anything similar before.</p>
  <p>Is there any way to avoid this issue?</p>