tce-load -i compiletc 

wget https://downloads.sourceforge.net/libpng/libpng-1.6.55.tar.xz
wget https://downloads.sourceforge.net/sourceforge/libpng-apng/libpng-1.6.54-apng.patch.gz

cd libpng-1.6.55

zcat ../libpng-1.6.54-apng.patch.gz | patch -p1

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var

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

make [0m 28.59s]
sudo make install