[jirka]

I just have tried to compile the BK-0010, 0011M and Terak 8510/a emulator on IRIX 6.5. It required slight alteration of Makefile (to add "-L/usr/nekoware/lib -lSDL" and "-lintl" on several places) and completely disabled sound and the TUN/TAP interface.
Then it compiled and it works well (so far, I didn't do much testing). And it is fast on my O2 (R10k/250). It compiles and works on POWER9 Linux, too.

I may upload the binaries if anyone will be interested.

The Elektronika BK  computers were Soviet home computers with CPUs compatible with PDP-11.