archive</a> might be advisable in case of difficulties.
</p>
+ <p>
+ Also note that on some installations of CygWin, one of the system
+ header files used the proprocessor to define <code>quad</code> to
+ <code>quad_t</code>. Since <acronym>deal.II</acronym> uses the name
+ <code>quad</code> as a function name, the name is sometimes
+ replaced, sometimes not, depending on the order of include files and
+ whether the respective system header was included at all. This leads
+ to compilation errors.
+ </p>
+
+ <p>
+ Since the offending preprocessor define is only active when
+ <code>_POSIX_SOURCE</code> is not set, <acronym>deal.II</acronym>
+ releases <em>after</em> version 3.4 set this flag, to avoid the
+ problem, but releases up to and including version 3.4 may not
+ work. For more information, refer to the
+ <a href="http://www.dealii.org/mail/msg00773.html">mailing list
+ thread on this subject</a>, and follow-up messages.
+ </p>
+
+
<h4>Other Windows compilers</h4>
<p>
Authomatic configuration requires a lot of Unix tools. We have not