GNU LilyPond program usage: 3.2.3 Environment variables

### 3.2.3 Environment variables

`lilypond` recognizes the following environment variables:

`LILYPOND_DATADIR`

  This specifies a directory where locale messages and data files will be looked up by default. The directory should contain subdirectories called ‘`ly/`’, ‘`ps/`’, ‘`tex/`’, etc.

`LANG`

  This selects the language for the warning messages.

`LILYPOND_GC_YIELD`

  With this variable the memory footprint and performance can be adjusted. It is a percentage tunes memory management behavior. With higher values, the program uses more memory, with smaller values, it uses more CPU time. The default value is `70`.

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#### Application Usage