librsvg can be imported via CMake FindPkgConfig module:

    find_package(PkgConfig REQUIRED)
    pkg_check_modules(librsvg REQUIRED IMPORTED_TARGET librsvg)
    target_link_libraries(main PkgConfig::librsvg)

vcpkg provides proprietary CMake targets:

    find_package(unofficial-librsvg CONFIG REQUIRED)
    target_link_libraries(main PRIVATE unofficial::librsvg::rsvg-2 unofficial::librsvg::pixbufloader-svg)