Starting with the HDF 4.4.0 release, HDF4 will no longer support Autotools. HDF 4.3.x will continue to support Autotools, but the release of HDF 4.3.1 in the summer of 2025 will be the last release of that series. This 4.3.1 release will concentrate on sanitizer issues, fixable bugs/issues, and documentation updates to reflect the current behavior of the library.