problem linking C++ app against libX11

Hi all.
I'm using debian etch (r2) together with lsb-sdk-3.1.1-5.ia32.
I set /opt/lsb/bin/lsbc++ as the compiler. Compilation goes ok,
but at link time I get the following error:

/usr/bin/ld: dynamic variable `XSynchronize' is zero size
/usr/bin/ld: /usr/local/lib/libFOX-1.6.a(FXApp.o)(.text+0x3972): 
unresolvable R_386_PC32 relocation against symbol `XSynchronize'
/usr/bin/ld: final link failed: Nonrepresentable section on output

Note that I've already succesfully compiled libFOX by means of lsbc++.
I've read this is a bug in lsb-3.1, with a patch in 3.2 not backported to 3.1.
How can I solve this?

I'm trying to use 'lsb-3.1 + statically linked fox' solution for distributing
not too big 'portable' binaries of applications with a GUI.
I can't use lsb-3.2 as it seems to be to be still in development,
and not supported by current distros.

Best regards,
Antonio, Fabio Di Narzo.