Undefined symbol "__libc_toupper_tab_"

[Yury Tarasievich <grog@xxxxxxx>]

I'm getting this message once each boot (I guess when ldconfig runs?) and also 
each time I try to run something like freebsd-4's opera or openoffice. System 
is 1.3.1 (May 31) and X is 6.8.2, compiled on it. What does that mean, I 
mean, deeper than not finding the (present) symbol?

/usr/libexec/ld-elf.so.1: /usr/X11R6/lib/libX11.so.6: Undefined symbol 
"__libc_toupper_tab_"