macro(CheckInterModuleDependencies)
    # ==============================================================================
    #inter-module dependencies

    # Takes a dependent module followed by a variable-length list of prerequisite
    # modules.  Warns if any of the prerequisite modules are disabled.
    function(REQUIRES_MODS dependent)
        if(${dependent})
            foreach(prerequisite IN LISTS ARGN)
                if(NOT ${prerequisite})
                    message(SEND_ERROR "${dependent} requires ${prerequisite} to be ON, but it"
                        " is \"${${prerequisite}}\"")
                    set(${dependent} OFF PARENT_SCOPE)
                    break()
                endif(NOT ${prerequisite})
            endforeach()
        endif(${dependent})
    endfunction(REQUIRES_MODS)

    REQUIRES_MODS(BUILD_ASSEMBLY           BUILD_PART BUILD_PART_DESIGN BUILD_SPREADSHEET)
    REQUIRES_MODS(BUILD_BIM                BUILD_PART BUILD_MESH BUILD_MESH_PART BUILD_DRAFT)
    REQUIRES_MODS(BUILD_DRAFT              BUILD_SKETCHER BUILD_TECHDRAW)
    REQUIRES_MODS(BUILD_DRAWING            BUILD_PART BUILD_SPREADSHEET)
    REQUIRES_MODS(BUILD_FEM                BUILD_PART)
    REQUIRES_MODS(BUILD_IMPORT             BUILD_PART BUILD_PART_DESIGN)
    REQUIRES_MODS(BUILD_INSPECTION         BUILD_MESH BUILD_POINTS BUILD_PART)
    REQUIRES_MODS(BUILD_JTREADER           BUILD_MESH)
    REQUIRES_MODS(BUILD_MESH_PART          BUILD_PART BUILD_MESH)
    REQUIRES_MODS(BUILD_FLAT_MESH          BUILD_MESH_PART)
    REQUIRES_MODS(BUILD_OPENSCAD           BUILD_MESH_PART BUILD_DRAFT)
    REQUIRES_MODS(BUILD_MATERIAL_EXTERNAL  BUILD_MATERIAL)
    REQUIRES_MODS(BUILD_MEASURE            BUILD_PART)
    REQUIRES_MODS(BUILD_PART               BUILD_MATERIAL)
    REQUIRES_MODS(BUILD_PART_DESIGN        BUILD_SKETCHER)
    # REQUIRES_MODS(BUILD_CAM              BUILD_PART BUILD_MESH BUILD_ROBOT)
    REQUIRES_MODS(BUILD_CAM                BUILD_PART BUILD_MESH)
    REQUIRES_MODS(BUILD_REVERSEENGINEERING BUILD_PART BUILD_MESH BUILD_POINTS)
    REQUIRES_MODS(BUILD_ROBOT              BUILD_PART)
    REQUIRES_MODS(BUILD_SANDBOX            BUILD_PART BUILD_MESH)
    REQUIRES_MODS(BUILD_SKETCHER           BUILD_PART)
    REQUIRES_MODS(BUILD_SPREADSHEET        BUILD_DRAFT)
    REQUIRES_MODS(BUILD_SURFACE            BUILD_PART)
    REQUIRES_MODS(BUILD_TECHDRAW           BUILD_PART BUILD_PART_DESIGN BUILD_SPREADSHEET BUILD_MEASURE BUILD_IMPORT)
endmacro(CheckInterModuleDependencies)