Thread by subject, at least through API?

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+To: notmuch@notmuchmail.org\r
+From: Daniel <quite@hack.org>\r
+Subject: Thread by subject, at least through API?\r
+Date: Tue, 28 Feb 2012 00:42:28 +0000 (UTC)\r
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+Message-ID: <slrnjko8nk.tg8.quite@kelebek.lublin.se>\r
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+I would like to thread some mails by subject, can I do this: get to the data\r
+and forge threads between messages that don't otherwise have any References or\r
+In-Reply-To:s?\r
+\r
+Basically I want to make mails with "Subject: XYZZY Re: foobar" replies to\r
+those without "Re:".\r
+\r