tce-load -i compiletc libXext-dev libpng-dev libjpeg-turbo-dev automake libtool-dev intltool gettext-dev

wget https://github.com/fltk/fltk/archive/refs/tags/release-1.3.9.tar.gz

cd fltk-release-1.3.9

patch -Np1 -i ../fltk-no-printing.patch
patch -Np1 -i ../fltk-ansi-patch-1.3.x.patch

cp ../AnsiMode.H src/

./autogen.sh

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 --localstatedir=/var --enable-shared --disable-gl --disable-xinerama --disable-xft --disable-xfixes --enable-xcursor --disable-xrender

make [3m 16.58s]

[fails at fluid due to printing patch]

sudo make install

Configuration Summary
-------------------------------------------------------------------------
    Directories: prefix=/usr/local
                 bindir=${exec_prefix}/bin
                 datadir=${datarootdir}
                 datarootdir=${prefix}/share
                 exec_prefix=${prefix}
                 includedir=${prefix}/include
                 libdir=${exec_prefix}/lib
                 mandir=${datarootdir}/man
       Graphics: X11 + Xdbe
Image Libraries: JPEG=System
                 PNG=System
                 ZLIB=System
    Large Files: YES
         OpenGL: NO
        Threads: YES