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From: Igor Robul <igorr@speechpro.com>
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Subject: Re: math/grace port: "libXcursor.so.1.0" not found ?? [SOLVED]
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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.