plugin in firefox

[Mikael Backman]

I use FreeBSD 6.0 and Firefox 1.5
I think I've done all the things I should do:

Installed ports linux-realplayer, linuxpluginwrapper and linux-flashplayer6
Copied the example file for FreeBSD 6 to /etc/libmap.conf

copied the files from /usr/X11R6/lib/linux-flashplugin6
and /usr/X11R6/lib/linux-mozilla/plugins
to /usr/X11R6/lib/browser-plugins

But when I run Firefox I get these errors:

LoadPlugin: failed to initialize shared library 
/usr/X11R6/lib/browser_plugins/nphelix.so 
[/usr/X11R6/lib/browser_plugins/nphelix.so: Undefined symbol "stderr"]
LoadPlugin: failed to initialize shared library 
/usr/X11R6/lib/browser_plugins/libflashplayer.so [Shared object 
"libpthread.so.0" not found, required by "libflashplayer.so"]