<p><a href="https://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html" rel="nofollow">https://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html</a></p>
<blockquote>
<p>I don't think Geany is guaranteed to be in the list of system search directories.</p>
</blockquote>
<p>It is, by the build system.</p>

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