Fwd: compiling problems for RISCOS

Hello. I have tried to build the Netsurf from sources. It was built with success when i set TARGET=framebuffer but when I tried riscos as target It failed with error: frontends/riscos/Makefile:10: *** Unable to find library for: Cares (libcares). I tried to install libc-ares-dev with no success. Could you advise how it could be fixed? Thanks