php-doc-en/reference/curl/configure.xml

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<section xml:id="curl.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
  To use PHP's cURL support you must also compile PHP <option
  role="configure">--with-curl[=DIR]</option> where DIR is the
  location of the directory containing the <filename>lib</filename> and <filename>include</filename>
  directories. In the <filename>include</filename> directory there should be a folder
  named <filename>curl</filename> which should contain the <filename>easy.h</filename> and
  <filename>curl.h</filename> files. There should be a file named 
  <filename>libcurl.a</filename> located in the <filename>lib</filename> directory. Before
  PHP 5.5.0 it was possible to configure PHP to use cURL for URL streams
  <option role="configure">--with-curlwrappers</option>.
 </para>
 <note>
  <title>Note to Win32 Users</title>
  <simpara>
  In order to enable this module on a Windows environment, 
  <filename>libeay32.dll</filename> and <filename>ssleay32.dll</filename>, or, as of OpenSSL 1.1
  <filename>libcrypto-*.dll</filename> and <filename>libssl-*.dll</filename>,
  must be present in your <envar>PATH</envar>. 
  Also <filename>libssh2.dll</filename> must be present in your <envar>PATH</envar>.
  </simpara>
  <simpara>
  You don't need <filename>libcurl.dll</filename> from the cURL site.
  </simpara>
  </note>
</section>

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