Problem installing Mathematica on FreeBSD 6.1

[Alexey Mikhailov]

Hello!

Sometime ago I posted this message to freebsd-questions@, but had no 
answer. So I'll try my luck
here.

---------------------------------------------------------

Hello!

I installed Mathematica 5.1 on my FreeBSD 6.1 system. And I can't run it..
That's very strange behaviour:

~/Mathematica/SystemFiles/FrontEnd/Binaries/Linux % ./Mathematica
./Mathematica: relocation error: /usr/X11R6/lib/libX11.so.6: undefined 
symbol: __stderrp

But:

~/Mathematica/SystemFiles/FrontEnd/Binaries/Linux % ldd Mathematica
Mathematica:
       libm.so.6 => /lib/libm.so.6 (0x284e5000)
       libpthread.so.0 => /lib/libpthread.so.0 (0x28507000)
       librt.so.1 => /lib/librt.so.1 (0x28558000)
       libXt.so.6 => /usr/X11R6/lib/libXt.so.6 (0x2856a000)
       libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x285b4000)
       libXmu.so.6 => /usr/X11R6/lib/libXmu.so.6 (0x285c1000)
       libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x285d5000)
       libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x285de000)
       libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x285f4000)
       libc.so.6 => /lib/libc.so.6 (0x286b5000)
       /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x284ca000)

~/Mathematica/SystemFiles/FrontEnd/Binaries/Linux % strings 
/lib/libc.so.6|grep __stderrp
__stderrp

Can someone point me out what's wrong?

Thanks!