tce-load -i compiletc 

https://downloads.sourceforge.net/libpng/libpng-1.6.37.tar.xz
https://downloads.sourceforge.net/sourceforge/libpng-apng/libpng-1.6.37-apng.patch.gz

cd libpng-1.6.37

gzip -cd ../libpng-1.6.37-apng.patch.gz | patch -p1

CC="gcc -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe" CXX="g++ -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -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 [1m 2.85s]
make install