<p><b>@bergzand</b> requested changes on this pull request.</p>

<p>Minor issues I've found so far</p><hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11874#discussion_r321975310">Makefile.dep</a>:</p>
<pre style='color:#555'>> @@ -884,6 +884,26 @@ ifneq (,$(filter riotboot_hdr, $(USEMODULE)))
   USEMODULE += riotboot
 endif
 
+ifneq (,$(filter riotboot_slot, $(USEMODULE)))
+  USEMODULE += riotboot_hdr
+endif
</pre>
<p>Unrelated change?</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11874#discussion_r321977159">sys/include/ztimer.h</a>:</p>
<pre style='color:#555'>> + *
+ * @{
+ *
+ * @file
+ * @brief       ztimer API
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ * @author      Joakim NohlgĂ„rd <joakim.nohlgard@eistec.se>
+ */
+
+#ifndef ZTIMER_H
+#define ZTIMER_H
+
+#include <stdint.h>
+
+#include "msg.h"
</pre>
<p>I think this also needs <code>kernel_types.h</code> to directly include <code>kernel_pid_t</code></p>

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