CMAKE_PROJECT_VERSION, where is this set in Faiss library

[rsrs2013]

I see that, we are having the below in CMakeLists.txt

write_basic_package_version_file(
  "${PROJECT_BINARY_DIR}/cmake/faiss-config-version.cmake"
  VERSION ${CMAKE_PROJECT_VERSION}
  COMPATIBILITY AnyNewerVersion
)

I get the below error when building it.

  No VERSION specified for WRITE_BASIC_CONFIG_VERSION_FILE()
Call Stack (most recent call first):
  /opt/homebrew/share/cmake/Modules/CMakePackageConfigHelpers.cmake:407 (write_basic_config_version_file)
  CMakeLists.txt:455 (write_basic_package_version_file)

how to avoid this error ?