How to build a custom WPILib in Windriver Workbench
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Make a WR WB project "WPILib" to build this copy of WPILib:
    New "Downloadable Kernel Module" project (*not* a Shared Libary project).
        You can create the project in the workspace directory with content at "external location", that is, the directory where you put the WPILib source code.
        Build Specs for PPC603gnu only; debug mode.
        Build tool: Librarian (*not* Linker); Pass the build target to the next level. [Does the "pass" checkbox matter?]

    Project Properties > C/C++ General > Indexer > Paths and Symbols > Sources/Filters
        Set a filter to exclude PPC603gnu/, .svn/, .settings/ . [Needed?]

    [Irrelevant. CInterfaces is absent in 2013.] Under the Project Explorer view's WPILib project, expand +Build Targets (PPC603gnu - debug), +WPILib (WPILib.a), +WPILib - recursive, +WPILib; select CInterfaces, hit Delete, and confirm excluding the CInterfaces/ directory from the build.
        [With these steps, WR WB won't fail trying to build CInterfaces. For some reason, setting Project Properties > C/C++ General > Paths and Symbols > Sources/Filters exclusion filters won't do it.]

    Approach 1:
      Start a build, let it analyze the needed include paths, add the WPILib/ source directory, and move that up to the top of the list.
      It should now say "There are 0 unresolved include directives".
      Proceed.
    Approach 2:
      Select WPILib project > Project Properties > Build Properties > Build Paths
        Add the WPILib/ source directory to the include paths and move that up to the first entry.
    Note: The other include path entries should be -I$(WIND_BASE)/target/h and -I$(WIND_BASE)/target/h/wrn/coreip
    Question: Is there a way to do this using a $variable rather than a hard-wired directory path so you could check in and share the project files?

    Build the Project. (If WB asks about generating include files, you can do it or skip it.)