how can I use all the plugins in mozilla

[Maher Mohamed]

i instaled the mozilla and the linuxpluginwrapper port
but i still get this error messages


 LoadPlugin: failed to initialize shared library
/usr/compat/linux/usr/local/Adobe/Acrobat7.0/Browser/intellinux/nppdf.so
[Shared object "libc.so.6" not found, required by "nppdf.so"]

why is that? 
and what is exactly that i should do.
I am using FreeBSD 5.4 Stable
thank you 
-- 
Mohamed M. Maher