Install.md

@@ -84,6 +84,14 @@ If you have difficulty locating standard packages, CMake documentation may help
 CMake variables can be specified on the command line in the form ``-D<var>=<value>``, eg. ``-DARCH=AVX2``
 Some useful variables are listed below:
 
+|Variable               | Values                        | Description                                           |
+|-----------------------|-------------------------------|------------------------------------------------------ |
+|WRAP_VTK               | on/off                        | Generate VTK interface code and scripting support     |
+|WRAP_TCL               | on/off                        |Generate TCL interface code                            |
+|CMAKE_BUILD_TYPE       | Release/Debug/RelWithDebInfo  |    Build type (use Release for best performance)      |
+|VTK_DIR                | path                          | Folder containing VTKConfig.cmake (eg /usr/local/lib/VTK-7.1.1/lib/cmake) |
+|BOOST_ROOT             | path                          | Location of Boost library and header files            |
+
 #### ARCH
 
 Specify the computer's architecture - must be either ``AVX`` or ``AVX2`` and the processor must support the named instruction set.