Added def files for making OpenGL DLLs (Mingw32); added comment to wxHTML format

doc; added OpenGL libs to makeg95.env


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/msw/install.txt

@@ -188,6 +188,11 @@ if necessary) that the project settings, especially the list of defined
 symbols, struct packing, etc. are exactly the same for all items in
 the project. After this, delete everything (including PCH) and recompile.
 
+Note (5): for some further notes about upgrading your project
+files to be compatible with wxWindows 2.1.14, please see
+"Highlights of wxWindows 2.1.14" from the Download page of the
+web site or CD-ROM.
+
 Visual C++ 1.5 compilation (16-bit)
 -----------------------------------
 
@@ -471,6 +476,19 @@ Notes:
 5. If there's a problem executing the windres program, try
    commenting out RCPREPROCESSOR in makeg95.env.
 
+6. OpenGL support should work with Mingw32 as-is. However,
+   if you wish to generate import libraries appropriate either for
+   the MS OpenGL libraries or the SGI OpenGL libraries, go to
+   include/wx/msw/gl and use:
+
+     dlltool -k -d opengl.def -llibopengl.a
+
+   for the SGI DLLs, or
+
+     dlltool -k -d opengl32.def -llibopengl32.a
+
+   and similarly for glu[32].def.
+
 References:
 
  - The GNU-WIN32 site is at