If I try to build flpicsee for x86_64 I get this: flpicsee.cpp:779:25: error: 'abs' was not declared in this scope
779 | if (abs(dragx - Fl::event_x()) < 3 && abs(dragy - Fl::event_y()) < 3) {
If I add "#include <cmath>" or "#include <cstdlib>" or "#include <stdlib.h>" the build suceeds, but flpicsee segfaults