Example locks up after a few seconds

[paulie-g]

When I break into it with kill -2 $PID:

      │                                          Program received signal SIGINT, Interrupt.                                                                                                                                                                                                                                                                                                   
      │                                            │                                       0x00007ffff7b6a36b in select () from /usr/lib/libc.so.6                                                                                                                                                                                                                                            
(gdb) │                                            │                                                                                                                                                                                                                                                                                                                                          
(gdb) │                                            │                                                                                                                                                                                                                                                                                                                                          
(gdb) ╰────────────────────────────────────────────╯                                                                                                                                                                                                                                                                                                                                          
(gdb)                                                                                                                                                                                                                                                                                                                                                                                         
(gdb)                                                                                                                                                                                                                                                                                                                                                                                         
(gdb)                                                                                                                                                                                                                                                                                                                                                                                         
(gdb)                                                                                                                                                                                                                                                                                                                                                                                         
(gdb) backtrace                                                                                                                                                                                                                                                                                                                                                                               
#0  0x00007ffff7b6a36b in select () from /usr/lib/libc.so.6                                                                                                                                                                                                                                                                                                                                   
#1  0x000055555559d6cd in wait_fill_event ()                                                                                                                                                                                                                                                                                                                                                  
#2  0x00005555555a0432 in tb_peek_event ()                                                                                                                                                                                                                                                                                                                                                    
#3  0x0000555555558afa in main () at examples/main.cpp:126

I think it's hitting nsf/termbox#115