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[RelNotes] Phrase the section about builtins in a "system first" manner. #21711

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hageboeck merged 1 commit into from
Mar 27, 2026
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[RelNotes] Phrase the section about builtins in a "system first" manner. #21711

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8 changes: 4 additions & 4 deletions README/ReleaseNotes/v640/index.md
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Expand Up @@ -69,11 +69,11 @@ The following people have contributed to this new version:

## Build System

### Handling of the builtins
### Moving from builtin dependencies to system-provided packages

* The previously vendored builtins `freetype`, `zlib`, `lzma`, `zstd`, `lz4`, `libpng`, `giflib`, `libjpeg` are now fetched as source tarballs from [SPI](https://spi.web.cern.ch)'s [website](https://lcgpackages.web.cern.ch/), as the vast majority of ROOT's builtins, e.g. `xrootd`.
* For the aforementioned packages and `openssl`, no automatic fall-back to their builtin versions is available any more: the user is informed of that with a helpful message. If desired, the CMake option `-Dbuiltin_XYZ=ON` has to be consciously chosen by the user.
* The general direction of the ROOT project is to become more and more reliant on system's packages. It is *recommended* to make the packages required by ROOT available on the system, e.g. via a package manager, and not with the builtin mechanism.
* The general direction of the ROOT project is to become more and more reliant on system packages. It is *recommended* to make the packages required by ROOT available on the system, e.g. via a package manager, and not with the builtin mechanism. This allows for timely updates and reduces the size of the installed binaries.
* The previously vendored builtins `freetype`, `zlib`, `lzma`, `zstd`, `lz4`, `libpng`, `giflib`, `libjpeg`, and `openssl` should be installed in the system if possible. ROOT will not automatically fall-back to their builtin versions if these are not found: the user is informed of that with a helpful message. If installing these dependencies in the system is not possible, the CMake option `-Dbuiltin_XYZ=ON` has to be consciously chosen by the user.
* For the builtin versions of `freetype`, `zlib`, `lzma`, `zstd`, `lz4`, `libpng`, `giflib`, `libjpeg`, the source tarballs are now fetched from [SPI](https://spi.web.cern.ch)'s [website](https://lcgpackages.web.cern.ch/), as for the vast majority of ROOT's builtins, e.g. `openssl` or `xrootd`.

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## Core Libraries

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