The `iftop` package does not appear to be working
$ opkg install iftop
Downloading https://repo.turris.cz/hbl/omnia/packages/packages/iftop_2018-10-03-77901c8c-2_arm_cortex-a9_vfpv3-d16.ipk
$ iftop -nNpbf 'src or dst 10.2.1.5'
Error relocating /usr/bin/iftop: __time64: symbol not found
Error relocating /usr/bin/iftop: __setitimer_time64: symbol not found
Error relocating /usr/bin/iftop: __getitimer_time64: symbol not found