Add "Verifying the Installation" section

Briefly explain how to check that wxWidgets is installed correctly.

This is again redundant with the information already present elsewhere,
but it seems worth repeating it here.

docs/doxygen/overviews/install.md

@@ -79,3 +79,39 @@ Otherwise, please use the appropriate instructions depending on your platform:
 
 The wxWidgets ports mentioned above are the main ones, however other variants
 also exist, see [platform details](@ref page_port) page for the full list.
+
+
+Verifying the Installation
+--------------------------
+
+After installing wxWidgets, it is recommended to check that the library can
+actually be used by building a minimal wxWidgets program using it, such as
+`samples/minimal/minimal.cpp` included in wxWidgets distributions.
+
+You may choose to build this program in any of the following ways:
+
+- Directly from command line under any Unix-like systems, including macOS and
+  Unix-like environments such as Cygwin or MSYS2 under MSW, just run
+
+    $ c++ -o minimal minimal.cpp `wx-config --cxxflags --libs`
+
+  Please note that you *must* use `wx-config` to obtain the compiler and linker
+  flags in this case.
+
+- Using CMake, and the provided `samples/minimal/CMakeLists.txt` file.
+
+- Using Microsoft Visual Studio IDE: simply create a new project and add the
+  provided `wxwidgets.props` property sheet file to it as explained in the
+  [instructions](@ref #msw_build_apps) and build the project as usual.
+
+- Using another IDE with wxWidgets support, such as [Code::Blocks][1] or
+  [CodeLite][2], please use the IDE wizards.
+
+[1]: https://www.codeblocks.org/
+[2]: https://codelite.org/
+
+- If you use another IDE, under Unix you should run `wx-config --cxxflags` and
+  `wx-config --libs` commands separately and copy-and-paste their output to the
+  "Additional preprocessor options" and "Additional linker options" fields in
+  your IDE, respectively. Under MSW systems you need to configure the IDE using
+  the instructions in the ["manual setup"](@ref #msw_build_apps) section.