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What is the Erlang/OTP release schedule? How many major versions are released per year, and is there a schedule you can link?
Which versions have long-term support (LTS)?
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Fundamentally, OTP releases are the means by which one or more applications are bundled up together for execution as a single unit.
Erlang/OTP 23.3 is the third and final maintenance patch package for OTP 23, with mostly bug fixes as well as a few improvements. A full list of bug fixes and improvements in the readme.
The latest version of Erlang/OTP is 25.0.4. To install Erlang you can either build it from source or use a pre-built package.
The latest version of Erlang/OTP is 24.1.7. To install Erlang you can either build it from source or use a pre-built package. Take a look at the Erlang/OTP 24 release description to see what changes Erlang/OTP 24 brings over the previous major version.
So Erlang Solutions provides up to date pre-built packages for the latest stable releases. Erlang Solutions provides pre-built binary packages for Ubuntu, Debian, Fedora, CentOS and other operating systems. Since Erlang/OTP 18.0, Erlang/OTP is released under Apache License 2.0.
The older releases prior to Erlang/OTP 18.0 were released under Erlang Public License (EPL), a derivative work of the Mozilla Public License (MPL).
You can also use third-party tools such as Kerl or asdf to compile Erlang. They help to remove the differences between Erlang/OTP releases and the OS you are compiling on.
Since the release of Erlang/OTP 18.0 in June 2015, there has been a major release every year in June, followed by minor releases (x.1, x.2, x.3) in September, December and March. There are also frequent patch packages announced on the erlang-announce mailing list.
I'm pretty sure this release schedule was announced on the erlang-questions mailing list, but I can't find it now...
There are, strictly speaking, no LTS versions. The documentation on supported releases says:
In general, bugs are only fixed on the latest release, and new features are introduced in the upcoming release that is under development. However, when we, due to internal reasons, fix bugs on older releases, these will be available and announced as well.
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