libwebp provides CMake targets:

    find_package(WebP CONFIG REQUIRED)
    # basic usage
    target_link_libraries(main PRIVATE WebP::webp WebP::webpdecoder WebP::webpdemux)
    # for manipulating the WebP graphics format container (port feature libwebpmux)
    target_link_libraries(main PRIVATE WebP::libwebpmux)
    # for sharp RGB to YUV conversion
    target_link_libraries(main PRIVATE WebP::sharpyuv)