| The value of this variable should be set prior to the first | |
| :command:`project` or :command:`enable_language` command invocation | |
| because it may influence configuration of the toolchain and flags. | |
| It is intended to be set locally by the user creating a build tree. | |
| Despite the ``OSX`` part in the variable name(s) they apply also to | |
| other SDKs than macOS like iOS, tvOS, or watchOS. | |
| This variable is ignored on platforms other than Apple. |