tce-load -i compiletc npth-dev libgcrypt-dev libassuan-dev libksba-dev gnutls35-dev libusb-dev

cd gnupg-2.1.21

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --libexecdir=/usr/local/lib/gnupg2

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [1m 21.90s]
sudo make install

[gnupg-2.2.7]
*** You need libassuan to build this program.
*** (at least version 2.5.0 (API 2) is required

        GnuPG v2.1.21 has been configured as follows:

        Revision:  9574820  (38260)
        Platform:  GNU/Linux (x86_64-pc-linux-gnu)

        OpenPGP:   yes
        S/MIME:    yes
        Agent:     yes
        Smartcard: yes 
        G13:       no
        Dirmngr:   yes
        Gpgtar:    yes
        WKS tools: no

        Protect tool:      (default)
        LDAP wrapper:      (default)
        Default agent:     (default)
        Default pinentry:  (default)
        Default scdaemon:  (default)
        Default dirmngr:   (default)

        Dirmngr auto start:  yes
        Readline support:    yes
        LDAP support:        no
        TLS support:         gnutls
        TOFU support:        yes
        Tor support:         yes