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----
-synopsis: "Lix no longer speaks the Nix remote-build worker protocol to clients or servers older than CppNix 2.3"
-cls: [1207, 1208, 1206, 1205, 1204, 1203, 1479]
-issues: [fj#325]
-credits: [jade]
-category: Breaking Changes
----
-
-CppNix 2.3 was released in 2019, and is the new oldest supported version. We
-will increase our support baseline in the future up to a final version of CppNix
-2.18 (which may happen soon given that it is the only still-packaged and thus
-still-tested >2.3 version), but this step already removes a significant amount
-of dead, untested, code paths.
-
-Lix speaks the same version of the protocol as CppNix 2.18 and that fact will
-never change in the future; the Lix plans to replace the protocol for evolution
-will entail a complete incompatible replacement that will be supported in
-parallel with the old protocol. Lix will thus retain remote build compatibility
-with CppNix as long as CppNix maintains protocol compatibility with 2.18, and
-as long as Lix retains legacy protocol support (which will likely be a long
-time given that we plan to convert it to a frozen-in-time shim).