<p>I suspect it's because <code>bool</code> is a macro and is explicitly undefined for some reason, for example here: <a href="https://github.com/geany/geany/pull/1251/commits/accf8e9e064b67438147c511280d791c21ac4835#diff-0c6231a9ef83163c81fdc226ac3dfc56R49" class="commit-link"><tt>accf8e9</tt>#diff-0c6231a9ef83163c81fdc226ac3dfc56R49</a></p>

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