tce-load -i compiletc python3.8 cairo-dev libXft-dev

git clone git://git.tuxfamily.org/gitroot/non/fltk.git ntk

cd ntk

CFLAGS="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe" CXXFLAGS="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe -fno-exceptions -fno-rtti" ./waf configure --prefix=/usr/local

find . -name ?.py -type f -exec sed -i 's/-O3//g' {} \;
find . -name ?.py -type f -exec sed -i 's/-O3//g' {} \;

./waf --verbose [2m 52.46s]
sudo ./waf install