Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.103:
  - Added FindHto4l.cmake and FindProphecy4f.cmake for finding those two MC generators in an LCG release;
  - Changed the environment to make applications look for LHAPDF files on /cvmfs/sft.cern.ch/lcg/external/lhapdfsets/current first.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.102:
  - Modified the include pathes used by atlas_generate_reflex_dictionary(...) not to include the package's header directory specifically.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.101:
  - Taught atlas_install_python_modules(...) to use atlas_build_run.sh when executing the python compilation/testing script;
  - Updated CLHEP to version CLHEP_2_4_1_3_atl02.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.100:
  - Updated Acts to version v5.0.0;
    * At the same time enabled the build of Fatras as part of Acts.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.99:
  - Updated FindGeant4.cmake to be compatible with 10.7.X;
  - Updated prmon to version 2.2.0;
  - Added FindApfel.cmake to AtlasLCG;
  - Fixed a mistake in how flake8 tests would be run by atlas_install_python_modules(...).

Tag to be used with the 21.X branches of atlas/athena.
Update(s) in this tag:
  - Made FindCairo.cmake work with >=LCG_92;
  - Stopped the (standalone) HDF5 build from installing PkgConfig files;
  - Switched the yampl build to downloading the source as a tarball instead of getting it from GitHub;
  - Added FindApfel.cmake to AtlasLCG.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.98:
  - (Slightly) Updated the GeoModel version, and dropped the "old" GeoModel find-modules;
  - Fixed Findnlohmann_json.cmake to add the JSON include directory correctly to $ROOT_INCLUDE_PATH;
  - Updated CLHEP to version CLHEP_2_4_1_3_atl01.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.97:
  - Removed the installation of the compiled bytecode files for python modules;
  - Multiple updates to FindGeant4.cmake;
    * Made it set a number of more environment variables, as required by Geant4 10.6;
    * Made it possible to pick up the G4 data files from somewhere other than the hardcoded AFS path during build;
  - Updated LWTNN to version 2.11.1;
  - Updated FindGaudi.cmake not to "re-run" in a given context on multiple calls;
  - Multiple updates to CheckerGccPlugins;

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.96:
  - Updated FindGeant4.cmake to add a missing environment variable needed by Geant4 10.6.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.95:
  - Switched to building all GeoModel libraries from the "new" GeoModel mono-repository;
  - Upgraded CLHEP to version 2.4.1.3;
  - Upgraded Geant4 to version 10.6.3.2;
  - Tweaked the linking options on the aarch64 platform.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.94:
  - Made it possible to use FindGaudi.cmake with a hand-built version of Gaudi;
  - Made it possible to globally change the default timeout of atlas_add_test(...) tests.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.93:
  - Fixes for GCC 11 in CheckerGccPlugins;
  - Updated the version of histgrinder to 0.1.3;
  - Updated the yampl package to build the external out of a tarball, and not GitHub;
  - Fixed the cpack_install.sh.in script to correctly remove .dbg files from -opt packages.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.92:
  - Made the CPack setup in AtlasCMake work with any build system generator, not just with GNU Make;
  - Cleaned the CLHEP configuration, so that it would use the same build system generator that the main ATLAS project is using;
  - Switched back to deep-copying imported targets in the exported CMake configurations of the ATLAS projects.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.91:
  - Modernised the CMake configuration files exported/installed by atlas_project(...);
  - Added Findnumpy.cmake and Findmatplotlib.cmake to AtlasLCG;
  - Fixed the (standalone) build of XRootD on macOS;
  - Added CLHEP and yampl to AthAnalysisExternals.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.90:
  - Introduced Findpprof.cmake to AtlasLCG;
  - Made FindTBB.cmake set up its imported targets correctly, and updated FindGaudi.cmake to use AtlasLCG's FindTBB.cmake directly.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.89:
  - The AtlasLCG modules now set up imported targets for the libraries and executables that they found;
  - Re-designed how ROOT and its dependencies would be built;
    * Enabling incremental builds for ROOT once more.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.88:
  - Updated the HDF5 build configuration not to patch the pkgconfig files on macOS;
  - Fixed the include directory setup made by atlas_add_library(...).

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.87:
  - Updated AnalysisBaseExternals to build successfully on macOS Big Sur;
    * Updated to building Python 3.8.6, and updated all clients of Python to expect this version;
    * Added patches on top of ROOT 6.22/02 to make it build successfully on the new OS;
  - Tweaked the build of HDF5 to avoid getting error messages during the CMake configuration of AnalysisBase on CentOS 7;
  - Deprecated atlas_depends_on_subdirs(...).

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.86:
  - Taught AtlasLCG to set the Boost_USE_DEBUG_RUNTIME variable according to the LCG platform being used.

Tag to be used with the master branch of atlas/athena.
Update(s) since 2.0.85:
  - Made multiple updates to allow AArch64 builds of the projects;
  - Added External/Gaudi for building Gaudi, and updated all the CMake code to make this possible.
    * For further details see: https://gitlab.cern.ch/atlas/atlasexternals/-/merge_requests/699