+<h3><a name="#crtmismatch">Visual C++ gives errors about multiply defined symbols, what can I do?</a></h3>
+
+If you get errors like this
+
+<pre>
+MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _xxxxxx already defined in LIBCD.lib(yyyyy.obj)
+</pre>
+
+when linking your project, this means that you used different versions of CRT
+(C Run-Time) library for wxWindows (or possibly another library) and the main
+project. Visual C++ provides static or dynamic and multithread safe or not
+versions of CRT for each of debug and release builds, for a total of 8
+libraries. You can choose among them by going to the "Code generation"
+page/subitem of the "C++" tab/item in the project proprieties dialog in VC6/7.
+<p>
+To avoid problems, you <strong>must</strong> use the same one for all
+components of your project. wxWindows uses multithread safe DLL version of the
+CRT which is a good choice but may be problematic when distributing your
+applications if you don't include the CRT DLL in your installation -- in this
+case you may decide to switch to using a static CRT version. If you build with
+<tt>wxUSE_THREADS == 0</tt> you may also use the non MT-safe version as it is
+slightly smaller and faster.
+<p>
+But the most important thing is to use the <strong>same</strong> CRT setting for
+all components of your project.
+