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

https://www.fltk.org/pub/fltk/1.3.5/fltk-1.3.5-source.tar.bz2

cd fltk-1.3.5

patch -Np1 -i ../fltk-no-printing.patch

CC="gcc -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -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 --disable-xcursor --disable-xrender

make [2m 35.91s]

[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