tce-load -i compiletc cmake wayland-dev wayland-protocols libjpeg-turbo-dev libxkbcommon-dev pango-dev libXcursor-dev libXinerama-dev

wget https://github.com/fltk/fltk/releases/download/release-1.4.2/fltk-1.4.2-source.tar.bz2

cd fltk-1.4.2

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe" -DCMAKE_CXX_FLAGS_RELEASE="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe -fno-exceptions -fno-rtti" -DCMAKE_INSTALL_PREFIX="/usr/local" -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE -DFLTK_BUILD_SHARED_LIBS=ON -DFLTK_BUILD_GL=OFF -DFLTK_BUILD_TEST=OFF -DFLTK_OPTION_PRINT_SUPPORT=OFF -DCMAKE_INSTALL_LIBDIR=lib ../

make [15m 47.50s]
sudo make install

-- Configuration Summary for FLTK 1.4.2 generated by CMake 3.23.1 --

-- The following OPTIONAL packages have been found:

 * ZLIB
 * PNG
 * JPEG

-- The following OPTIONAL packages have not been found:

 * Doxygen

-- Static libraries    will be built in: /usr/src/fltk-1.4.2/build/lib
-- Shared libraries    will be built in: /usr/src/fltk-1.4.2/build/lib
-- The forms library   will be built in: /usr/src/fltk-1.4.2/build/lib
-- The OpenGL library  will not be built (set FLTK_BUILD_GL=ON to build)
-- fluid               will be built in: /usr/src/fltk-1.4.2/build/bin
-- fltk-options        will be built in: /usr/src/fltk-1.4.2/build/bin
-- Test programs       will not be built (set FLTK_BUILD_TEST=ON to build)
-- Example programs    will not be built (set FLTK_BUILD_EXAMPLES=ON to build)
-- 
-- Build configuration      Release
-- Installation prefix      /usr/local

-- Bundled Libraries        JPEG     = System: /usr/local/lib/libjpeg.so
--                          PNG      = System: /usr/local/lib/libpng.so
--                          ZLIB     = System: /usr/lib/libz.so
--                          Libdecor = Bundled

-- Use Wayland              Yes (can also run as X11 client)
-- All drawing uses Cairo   Yes
-- Use Pango                Yes
-- Fl_Cairo_Window support  No
-- Use std::                No

-- End of Configuration Summary --