The CMake build system has many options which can affect the build. These should all be documented in the Installation Guide. The options which can be set to point CMake to a package, e.g. XERCESC_ROOT_DIR, should also have standardised names in line with CMake recommendations.
Documentation will be improved, with links to the CMake documentation where needed.
New section added to end of CMake section of install guide to list all options. Have begun to fill this out.
New installation guide shipped with version 9.5 resolves this bug.