if (MINGW)
  find_package(ZLIB REQUIRED)
  set(ZLIB_LIBRARIES /mingw64/lib/libz.a)
else()
  set(ZLIB_PROJECT_NAME zlib_${ZLIB_VERSION})
  set(ZLIB_BUILD_ROOT ${EXTERNAL_BUILD_ROOT}/builds/${ZLIB_PROJECT_NAME})
  set(ZLIB_CMAKE_ARGS
    -DBUILD_SHARED_LIBS=OFF
    -DCMAKE_BUILD_TYPE=${EXTERNAL_BUILD_TYPE}
    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
    -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
    -DCMAKE_GENERATOR=${CMAKE_GENERATOR}
    -DCMAKE_INSTALL_PREFIX=${EXTERNAL_BUILD_ROOT}
    -DCMAKE_POSITION_INDEPENDENT_CODE=${CMAKE_POSITION_INDEPENDENT_CODE}
  )

  if (CMAKE_TOOLCHAIN_FILE)
    set(ZLIB_CMAKE_ARGS
      ${ZLIB_CMAKE_ARGS}
      -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} 
    )
  endif()

  ExternalProject_Add(zlib_project
    DOWNLOAD_NO_PROGRESS 1
    URL https://github.com/madler/zlib/archive/v${ZLIB_VERSION}.tar.gz
    PREFIX ${ZLIB_BUILD_ROOT}
    CMAKE_ARGS ${ZLIB_CMAKE_ARGS}
  )

  set(ZLIB_LIBRARIES ${EXTERNAL_BUILD_ROOT}/lib/libz${CMAKE_STATIC_LIBRARY_SUFFIX})
endif()