Would it make sense to add the include directories to find_directory(). We currently have /boot/common/include being used for many 3rd party libs, which is either set using --include-dir=/boot/common/include, `finddir B_COMMON_DIRECTORY`/include or just derived from the prefix being set to /boot/common. It might be handy if we had B_COMMON_INCLUDE_DIRECTORY or B_COMMON_HEADER_DIRECTORY that could be used for this, and B_SYSTEM_HEADERS_DIRECTORY to point to what is (currently) /boot/develop/headers. Also can we make it consistent, should it be INCLUDE, HEADER, or HEADERS? -scottmc