From Alberto Luaces,"the current code uses the preprocessor for generating the plugin path in

a way that when CMAKE_INSTALL_PREFIX contains something along the lines
of

/usr/x86_64-linux-gnu/

it gets substituted as

/usr/x86_64-1-gnu/

that is, the string is preprocessed again, thereby making changes to
anything that matches any defined symbol, as "linux" in this example
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763816).

Quoting that path directly in CMake scripts solves that problem.
"


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14522 16af8721-9629-0410-8352-f15c8da7e697

src/osgDB/CMakeLists.txt

@@ -7,7 +7,7 @@ IF   (DYNAMIC_OPENSCENEGRAPH)
 
     IF(OSG_PLUGIN_SEARCH_INSTALL_DIR_FOR_PLUGINS)
         # Add a default plugin search path component
-        ADD_DEFINITIONS(-DOSG_DEFAULT_LIBRARY_PATH=${CMAKE_INSTALL_PREFIX}/lib${LIB_POSTFIX}/${OSG_PLUGINS})
+        ADD_DEFINITIONS(-DOSG_DEFAULT_LIBRARY_PATH=\"${CMAKE_INSTALL_PREFIX}/lib${LIB_POSTFIX}/${OSG_PLUGINS}\")
     ENDIF()
 
     # Set the library extension according to what configuration is being built.

src/osgDB/FileUtils.cpp

@@ -510,7 +510,7 @@ static void appendInstallationLibraryFilePaths(osgDB::FilePathList& filepath)
 #ifdef OSG_DEFAULT_LIBRARY_PATH
 
     // Append the install prefix path to the library search path if configured
-    filepath.push_back(ADDQUOTES(OSG_DEFAULT_LIBRARY_PATH));
+    filepath.push_back(OSG_DEFAULT_LIBRARY_PATH);
 #endif
 }