libXinerama.so.2 - where to find this one?

[herbert langhans <w3%langhans.com.pl@localhost>]

Hi List,
strange things happen here.

I updated some binaries via pkg_add and lost somewhere the file
libXinerama.so.2 - just libXinerama.so.1 remains.

Now seamonkey, firefox, pidgin and other programs dont run. The error is
the same:
$seamonkey
XPCOMGlueLoad error for file /usr/pkg/lib/seamonkey/libxpcom.so:
Shared object "libXinerama.so.2" not found
Couldn't load XPCOM.

$ firefox
XPCOMGlueLoad error for file /usr/pkg/lib/xulrunner/libxpcom.so:
Shared object "libXinerama.so.2" not found
Couldn't load XPCOM.

In what package is this libxpcom.so.2 hidden? The usual glib and gtk2+
is there. Any hints? I am really lost ...

Thanks!
herb langhans