tce-load -i compiletc git libXext-dev libpng-dev libjpeg-turbo-dev

git clone https://github.com/tinycorelinux/fltk_projects

cd fltk_projects

edit Makefile
CXXFLAGS += -march=armv8-a+crc -mtune=cortex-a72


make [2m 35.91s]
sudo make install