-- Found VPX: /usr/lib/libvpx.so  
CMake Warning at CMakeLists.txt:218 (find_package):
  By not providing "FindWebP.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "WebP", but
  CMake did not find one.

  Could not find a package configuration file provided by "WebP" with any of
  the following names:

    WebPConfig.cmake
    webp-config.cmake

  Add the installation prefix of "WebP" to CMAKE_PREFIX_PATH or set
  "WebP_DIR" to a directory containing one of the above files.  If "WebP"
  provides a separate development package or SDK, be sure it has been
  installed.


-- Found PkgConfig: /usr/bin/x86_64-pc-linux-gnu-pkg-config (found version "1.5.4") 
-- Checking for module 'libwebp'
--   Package 'libwebp', required by 'virtual:world', not found
CMake Error at CMakeLists.txt:223 (message):
  libwebp not found


-- Checking for module 'libwebpmux'
--   Package 'libwebpmux', required by 'virtual:world', not found
CMake Error at /usr/share/cmake/Modules/FindPkgConfig.cmake:607 (message):
  A required package was not found
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPkgConfig.cmake:829 (_pkg_check_modules_internal)
  CMakeLists.txt:225 (pkg_check_modules)