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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12317#discussion_r329170006">Makefile.include</a>:</p>
<pre style='color:#555'>> @@ -106,6 +106,11 @@ OS := $(shell uname)
 # set python path, e.g. for tests
 PYTHONPATH := $(RIOTBASE)/dist/pythonlibs/:$(PYTHONPATH)
 
+# set default PROGRAMMER value if flashing a board on IoT-LAB
+ifneq (,$(IOTLAB_NODE))
+  PROGRAMMER = iotlab
</pre>
<p>Keep it with <code>?=</code> to allow easily overwriting it from the environment in case it is required.</p>

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