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+A cross-platform library for setting environment variables. Note:
+Since base-4.7.0.0 the functions setEnv and unsetEnv are provided by
+System.Environment. System.SetEnv merily re-exports those functions
+when built with base >= 4.7.
+
+After uninstalling, run this command to unregister the package from
+the ghc package database: ghc-pkg recache