I am forwarding an error reported on the inetutils mailing list. The problem is that readline 6.x exports `xmalloc' and `xrealloc', and it causes a linker error when used together with gnulib.
Probably readline shouldn't export these symbols, but I think it should be possible somehow to workaround this problem in gnulib as well. What do you think? This is a known bug, the reason if I recall is that readline exports xmalloc and xrealloc is to allow programs to hook their own version into readline. So the readline maintainer has declined any fixes for this.