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### Other Special Variables

GNU `make` also supports a special variable. Note that any value you assign to this variable will be ignored; it will always return its special value.

The first special variable is `.VARIABLES`. When expanded, the value consists of a list of the names of all global variables defined in all makefiles read up until that point. This includes variables which have empty values, as well as built-in variables (see Variables Used by Implicit Rules), but does not include any variables which are only defined in a target-specific context.