You may not need anything extra, just --enable-soap. For some reason reading these notes made me think some other installation was required. You can just recompile with --enable-soap.
For linux try php -i | grep configure and run your new configure with that same list, just append --enable-soap at the end.
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Server IP: 208.69.120.55
Probable Submitter: 74.218.200.2
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Manual Page -- http://www.php.net/manual/en/soap.installation.php
Edit -- https://master.php.net/note/edit/102744
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