[Haskell-cafe] setting ISO-8859-1 encoding on Raspbian for GHC

On Raspbian Buster I get: pi@raspberrypi:~ $ LANG=de_DE ghc -e 'print System.IO.localeEncoding' UTF-8 pi@raspberrypi:~ $ LANG=de_DE.iso88591 ghc -e 'print System.IO.localeEncoding' UTF-8 pi@raspberrypi:~ $ LANG=de_DE@euro ghc -e 'print System.IO.localeEncoding' UTF-8 Which is not, what I want. On Debian Buster it is correct: $ LANG=de_DE ghc -e 'print System.IO.localeEncoding' ISO-8859-1 How can I check whether this is a GHC problem and has anyone an idea how to fix it?