Asuswrt-Merlin 378.56_2 and Optware-NG - no 'libtinfo.so.5'-library

Hello,

I've just updated my RT-AC68U from the latest John's-fork to the latest Merlin version and I also have installed Optware-NG according to the how-to at hqt.ro (to my external usb-hdd). The first program I've installed was the text editor 'nano'. With John's fork I had no issues running this program (last time was some days ago).
But with the latest Asuswrt-Merlin (378.56_2) I get the error after...

Asuswrt-Merlin 378.56_2 and Optware-NG - no 'libtinfo.so.5'-library