meson implementation in C
fix interp_error with no error node
add regen dep for configure_file/run_command input
change signature of relativize_paths


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muon is an implementation of the meson build system in c99 with minimal dependencies.


  • bug-for-bug compatibility with meson. In fact, muon aspires to be stricter than meson in cases where meson's implementation seems error prone. muon uses the official meson documentation as its specification.
  • cli compatibility with meson. muon has different flags, subcommands, etc., and should not be renamed/symlinked to meson.

Other differences from meson are described in doc/differences.md


  • muon analyze - a static analyzer for meson.build files. Capable of doing type inference, checking unused variables, undeclared variables, etc.
  • muon fmt - a meson.build code formatter
  • An interactive stepping debugger with the dbg() function.
  • Fast


muon is close to feature-complete (bugs notwithstanding!) with the core of meson for c and c++.

See the status page for more detailed information.

Things missing include:

  • cross-compilation support
  • build optimizations like pch and unity
  • several b_ options
  • dependencies with a custom configuration tool
  • many modules

If you want to contribute, try using muon to build your favorite project. Patches and bug reports welcome!



  • c99
  • ninja-compatible build tool

Bootstrap with libpkgconf support:

  • libpkgconf
  • pkgconf or pkg-config
  • sh

[wrap-file] support:

  • libcurl
  • libarchive


  • scdoc for muon.1 and meson.build.5
  • python3
  • py3-yaml


  • python3


The bootstrapping process has two stages. The first stage produces a muon binary capable of building itself (but not necessarily anything else). The second stage produces the final binary.

Stage 1:

mkdir build
c99 -Iinclude src/amalgam.c -o build/muon

However, this version of muon will never be able to look up any dependencies. If are going to need dependency() to work, use the provided bootstrapping script, which links in libpkgconf if it is available.

./bootstrap.sh build

Stage 2:

build/muon setup build
ninja -C build


build/muon -C build test

muon has a few of its own tests for core language features, but the majority of the tests are copied from the meson project.


build/muon -C build install


Please refer to the contributing guide before sending patches. Send patches on the mailing list, report issues on the issue tracker, and discuss in #muon on libera.chat.


muon is licensed under the GPL version 3 (see LICENSE). Tests under tests/project were copied from the meson project tests and are licensed under Apache 2.0.


Although I had already had the idea to re-implement meson in C, I was initially inspired to actually go out and do it when I saw boson. muon's code was originally based on boson, though has since been almost completely rewritten.