math/grace port: "libXcursor.so.1.0" not found ?? [SOLVED]

[Igor Robul]

Sorry,
I have reread manual page for dlerror() and found that it need clear 
error state after call, but
dlerror() in src/libc/gen/dlfcn.c does not do this:

#pragma weak dlerror
const char *
dlerror(void)
{
    return sorry;
}

So error is in FreeBSD libc, if I understand this correctly. I'll do PR.