<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11725#discussion_r295397326">makefiles/boards/sam0.inc.mk</a>:</p>
<pre style='color:#555'>>    PROGRAMMER ?= edbg
+else ifeq ($(DEBUG_ADAPTER),jlink)
+  # only use JLinkExe if it's installed
+  ifneq (,$(shell which JLinkExe)))
</pre>
<p>Ok.</p>

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