tce-load -i 

cd at-3.1.16

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 --with-etcdir=/usr/local/etc --with-jobdir=/var/at/atjobs --with-atspool=/var/at/atspool --with-daemon_username=root --with-daemon_groupname=root

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

Edit atd.c
#define SENDMAIL "sendmail"

make
sudo make install