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There is a newer version: 0.0.8

#!/bin/bash
# The MIT License (MIT)
#
# Copyright (c) 2024 Objectionary.com
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# Taken from here: https://github.com/haskell/docker-haskell/blob/master/9.10/bullseye/Dockerfile

set -ex

if ghc --version 2>/dev/null; then
  echo "GHC already installed"
  exit
fi

cd /tmp
ARCH="$(dpkg-architecture --query DEB_BUILD_GNU_CPU)"
GHC_URL="https://downloads.haskell.org/~ghc/${GHC}/ghc-${GHC}-${ARCH}-deb11-linux.tar.xz"
case "${ARCH}" in \
    'aarch64') \
        GHC_SHA256='1db449c445d34779d4deaba22341576f7b512a05b6c2b5cb64f3846d1509714e'; \
        ;; \
    'x86_64') \
        GHC_SHA256='78975575b8125ecf1f50f78b1016b14ea6e87abbf1fc39797af469d029c5d737'; \
        ;; \
    *) echo >&2 "error: unsupported architecture '${ARCH}'" ; exit 1 ;; \
esac
curl -sSL "${GHC_URL}" -o ghc.tar.xz
echo "${GHC_SHA256} ghc.tar.xz" | sha256sum --strict --check

GNUPGHOME="$(mktemp -d)"; export GNUPGHOME
curl -sSL "${GHC_URL}.sig" -o ghc.tar.xz.sig
gpg --batch --keyserver keyserver.ubuntu.com --receive-keys "FFEB7CE81E16A36B3E2DED6F2DE04D4E97DB64AD"
gpg --batch --verify ghc.tar.xz.sig ghc.tar.xz
gpgconf --kill all

tar xf ghc.tar.xz
cd "ghc-${GHC}-${ARCH}-unknown-linux"
./configure --prefix "/opt/ghc/${GHC}"
make install

"/opt/ghc/${GHC}/bin/ghc" --version