/usr/local/include/pangolin/display/widgets.h:153:50: required from here
/usr/local/include/sigslot/signal.hpp:1180:65: error: ‘slots_reference’ was not declared in this scope
1180 | cow_copy_type<list_type, Lockable> ref = slots_reference();
| ~~~~~~~~~~~~~~~^~
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:63: CMakeFiles/ORB_SLAM3.dir/src/System.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:390: CMakeFiles/ORB_SLAM3.dir/all] Error 2
make: *** [Makefile:84: all] Error 2