Problem installing Mathematica on FreeBSD 6.1

[Alexey Mikhailov]

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!