Download musl

Git repository

The latest musl source is always available via the git revision control system. Efforts are made to keep the master branch in a state that not only compiles and works, but that works at least as well or better than the latest release.

The following command can be used to checkout a copy of the musl git repository:

$ git clone git://

Source and revision history are also browsable online via cgit.

Official releases

musl generally follows a time-based release cycle, with versions spaced roughly one to three months apart. Version numbering, however, is based on an evolving roadmap for particular compatibility and feature goals. Releases are timed so as to make fixes for major bugs available in release form as soon as possible while leaving ample time for testing after significant invasive changes.

See below for release notes summaries and download links.

Current Versions

Mainline - 1.1.5

This series is actively developed but intended for use in production environments as long as appropriate testing is performed, and should be preferred whenever there is a need for supporting an arbitrary, expanding set of packages or environments.

musl-1.1.5.tar.gz - Oct 14, 2014

This release adds full library-level support for C11, including the C11 threads API, and features major performance and correctness improvements to the implementations of thread synchronization primitives, especially condition variables. Several serious bugs have been fixed, including a failure to null-terminate certain unexpected DNS replies, use of uninitialized memory in caller-provided thread stacks, writes past the end of of the buffer when swab() is called with an odd length, and missing memory barriers in several places. Many other minor bugs have also been fixed.

Stable - 1.0.4

This series does not add new features and avoids changes that might affect building packages against musl or using applications in environments where they are already known to work. It is intended mostly for developers targetting a fixed profile of application software and kernel, such as in embedded development.

musl-1.0.4.tar.gz - Aug 1, 2014

This maintenance release brings the 1.0 branch up to date with all important bug fixes that have been applied to mainline as of 1.1.4. These include a major logic bug in memmem which yielded both false negatives and false positives, numerous issues that were specific to mips, powerpc, and microblaze, and various other lower-severity bugs.

Older versions

Earlier versions of musl have been moved to a separate page.