<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=811085" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/elextr">@elextr</a>: the issue was caused by an incomplete makefile in the workbench plugin. It missed  <code>$(WORKBENCH_CFLAGS)</code> in the <code>workbench_la_CFLAGS</code>. The result was that building it locally on my machine worked, but the Travis CI build failed.</p>

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