### 2.1. Building, installing and using a Midipix distribution

  A Midipix distribution consists of the following:

  * the native Midipix toolchain, consisting of perk, gcc, its dependencies,

    and binutils,

  * musl, a lightweight, fast, simple, and free libc[[1](https://www.musl-libc.org/faq.html)] used by Midipix,

  with a pattern in it.

  The following parameters are defined by default during ``install_files``:

  | Name           | Value                                  |

  | -------------  | -------------------------------------- |

  | _builddir      | ${PKG_BUILD_DIR}                       |

  | _workdir       | ${BUILD_WORKDIR}                       |

  The following operation flags are defined:

  | Flag      | Description              |

  | --------- | ------------------------ |

  | ``?``     | Continue on soft failure |

  The following operations are defined:

  | Operation      | Arity  | Description                                                      |

  | -------------- | ------ | ---------------------------------------------------------------- |

  | ``-``          | Unary  | Remove directories and/or files                                  |

  | ``T``          | Binary | touch(1) files and/or directories with timestamp                 |

  The following expression modifiers are defined:

  | Modifier       | Description                               |

  | -------------- | ----------------------------------------- |

  | ``@``          | Recursively reevaluate after substituting |

  The following subexpression operators are defined:

  | Operation      | Arity  | Description                                                      |

  | -------------- | ------ | ---------------------------------------------------------------- |

  | ``##``         | Unary  | Remove largest prefix from left-hand side                        |