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/branches/OpenSceneGraph-3.2@14521 16af8721-9629-0410-8352-f15c8da7e697