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In b3cfdc2 the license was changed to GPL-2.0-or-later which is an SPDX expression, however cabal only interprets the license field as an SPDX expression if cabal-version is 2.2 or later.
Starting with 2.2 cabal-version also has to be the first statement in the .cabal file.
https://www.haskell.org/cabal/users-guide/developing-packages.html#pkg-field-license
I noticed this because
cabal2nix
was acting up that the license was invalid.