OpenSceneGraph DEBUG DLLS install instructions.

git-svn-id: https://openmodelica.org/svn/OpenModelicaExternal/trunk@192 20e99eb2-9666-4e79-a4bd-0251279e2d9b

INSTALL.txt

 OMDev=OpenModelica Development Environment-MSYS2+MINGW32/MINGW64
 ----------------------------------------------------------------
-Adrian.Pop@liu.se, 2010-10-24, last update: 2016-04-04
+Adrian.Pop@liu.se, 2010-10-24, last update: 2016-09-16
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 To check for an updated version of this package go to:
 https://openmodelica.org/svn/OpenModelicaExternal/trunk/tools/windows/OMDev
@@ -65,6 +65,13 @@ Start msys2 shell: path_to_your_omdev\tools\msys\msys2_shell.bat
 Type command:
 > pacman -S mingw-w64-i686-qt5 mingw-w64-x86_64-qt5
 
+OpenSceneGraph DEBUG DLLS (optional)
+====================================
+We don't ship the debug dlls for OSG, you can install them with the following command.
+Start msys2 shell: path_to_your_omdev\tools\msys\msys2_shell.bat
+Type command:
+> pacman -S mingw-w64-i686-OpenSceneGraph-debug mingw-w64-x86_64-OpenSceneGraph-debug
+
 Address questions/problems to:
 Adrian Pop,
 Adrian.Pop@liu.se