Compile gnupg 2.4.x from Source for Debian Testing

compile_gnupg.sh

# assumes new Debian Testing VM, for purpose of compiling, running below as root
# uses most libs already available from apt, only compiles lib ntbtls

gnupg_version=${GNUPG:-2.4.6}
ntbtls_version=${NTBTLS:-0.3.1}
DESTDIR=${DESTDIR:-'/'}

lsb_release -a
uname -a

apt update -qqq
apt -y install wget gpg
apt -y autoremove

wget https://gnupg.org/signature_key.asc
gpg --import signature_key.asc
gpg -k
wget https://www.gnupg.org/signature_key.html
cat signature_key.html | grep -A 1 ed25519
# verify fingerprints

wget "https://www.gnupg.org/ftp/gcrypt/ntbtls/ntbtls-${ntbtls_version}.tar.bz2"
wget "https://www.gnupg.org/ftp/gcrypt/ntbtls/ntbtls-${ntbtls_version}.tar.bz2.sig"
wget "https://www.gnupg.org/ftp/gcrypt/gnupg/gnupg-${gnupg_version}.tar.bz2"
wget "https://www.gnupg.org/ftp/gcrypt/gnupg/gnupg-${gnupg_version}.tar.bz2.sig"

gpg --verify ntbtls-${ntbtls_version}.tar.bz2.sig
gpg --verify gnupg-${gnupg_version}.tar.bz2.sig
# verify sigs

apt -y remove gpg-agent

apt -y install curl zip unzip bzip2 gettext texinfo gnutls-bin libgnutls28-dev build-essential checkinstall libbz2-dev zlib1g-dev libsqlite3-dev libldap-dev dirmngr pinentry-curses libassuan0 libassuan-dev libksba8 libksba-dev libnpth0 libnpth0-dev libncurses-dev libncurses6 libgpgme11 libgpgme-dev libgpg-error0 libgpg-error-dev gpgrt-tools libgcrypt20 libgcrypt20-dev
apt -y autoremove

bunzip2 ntbtls-${ntbtls_version}.tar.bz2
tar xvf ntbtls-${ntbtls_version}.tar
bunzip2 gnupg-${gnupg_version}.tar.bz2
tar xvf gnupg-${gnupg_version}.tar

cd ntbtls-${ntbtls_version} && ./configure && make && make install "DESTDIR=${DESTDIR}" && cd ..
cd gnupg-${gnupg_version} && ./configure && make && make install "DESTDIR=${DESTDIR}"&& cd ..
mkdir -p "${DESTDIR}etc/ld.so.conf.d/"
echo "/usr/local/lib" > "${DESTDIR}etc/ld.so.conf.d/gpg2.conf"

exec "${DESTDIR}usr/local/bin/gpg" --version

# reboot & done

gnupg-2.4.3.tgz