title: Install icu4c version 63 with Homebrew
body: <p>I was trying to start <code>psql</code> but got</p>
  
  <pre><code>psql: could not connect to server: No such file or directory
      Is the server running locally and accepting
      connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
  </code></pre>
  
  <p>When I used <code>postgres -D /usr/local/var/postgres</code>, got the following error:</p>
  
  <pre><code>dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.63.dylib
    Referenced from: /usr/local/bin/postgres
    Reason: image not found
  [1]    2559 abort      postgres -D /usr/local/var/postgres
  </code></pre>
  
  <p>A quick search on <code>libicui18n.63.dylib</code> showed me I need <code>icu4c</code> lib with version 63. However <code>brew list icu4c</code> says I have the version 64.2. </p>
  
  <p>I tried both <code>brew install icu4c 63</code> &amp; <code>brew install icu4c@63</code> but no luck.</p>
  
  <p>Can anyone help, please? Thanks in advance.</p>