[CMake] escape a variable

[Brad King]

klaas.holwerda wrote:
> I like to have an include path in my VC project files and makefiles, 
> which is variable like:
> 
> /I "$(WXWIN)"\lib\vc_dll\mswud
> 
> i tried something like:
> 
> SET( WXINCLUDES  "\$(WXWIN)" )
> 
> but that was not oke.
> So how can i achieve that the variable is not touched by Cmake itself?

CMake expands variables that are surrounded by curly braces "${}", not 
parens "$()", so just write that without the backslash.

-Brad