Everything default (make without arguments), using g++. Ubuntu 20.04 is updated completley.

g++ --version gives:

gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.

Disabling silent mode shows:

Compiling drivers/X11/Fl_X11_Screen_Driver.cxx...
g++ -I..   -I../jpeg  -Os -Wall -Wunused -Wno-format-y2k  -fno-exceptions -fno-strict-aliasing -ffunction-sections -fdata-sections -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16  -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16   -DFL_LIBRARY -c drivers/X11/Fl_X11_Screen_Driver.cxx -o drivers/X11/Fl_X11_Screen_Driver.o
drivers/X11/Fl_X11_Screen_Driver.cxx: In member function ‘virtual Fl_RGB_Image* Fl_X11_Screen_Driver::read_win_rectangle(int, int, int, int, Fl_Window*, bool, bool*)’:
drivers/X11/Fl_X11_Screen_Driver.cxx:726:9: warning: ‘sy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  726 |     off = a - b;
      |     ~~~~^~~~~~~
drivers/X11/Fl_X11_Screen_Driver.cxx:789:21: note: ‘sy’ was declared here
  789 |     int dx, dy, sx, sy, sw, sh;
      |                     ^~

Maybe @ManoloFLTK does not use optimization? Or using cmake?

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