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.

Beginning with 1.1.7, releases are signed with the project GPG key. Its fingerprint is 8364 8929 0BB6 B70F 99FF DA05 56BC DB59 3020 450F and can be cross-checked against @musllibc on Twitter.

See below for release notes summaries and download links.

Current Versions

Mainline - 1.1.20

This series is actively developed but intended for use in production environments as long as appropriate testing is performed.

musl-1.1.20.tar.gz (sig) - September 4, 2018

This release introduces the ability to replace/interpose the allocator (malloc) subject to certain restrictions, adds an experimental m68k port, and makes notable improvements to stdio (application-provided buffers), getaddrinfo (AI_ADDRCONFIG, support for IPv4-only kernel configurations), the dynamic linker (safety against dlopen of libraries using initial-exec TLS model, reclaiming unused memory on FDPIC archs, better dladdr results), and handling of default thread stack size (pthread_setattr_default_np now works more reliably).

Many bugs have been fixed, including potentially dangerous regressions in iconv (only for new conversions to legacy encodings) and visibly incorrect behavior in printf on non-x86 archs (%a format with precision specifier), in getopt_long_only when short options are a prefix for a long option, in complex arc-trig/hyperbolic functions, in strftime and mktime (timezone-specific issues), and numerous less-obvious places.

Older versions

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