libstdc++.so.6 not found

[map7]

I'm using FreeBSD 7.0 p6 and recently my fluxbox has stopped working. I get the error in my .xessions-errors file as follows:

(process:15499): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.
/usr/local/etc/gdm/Xsession: Beginning session setup...
/usr/local/etc/gdm/Xsession: Setup done, will execute: /usr/bin/ssh-agent -- startfluxbox
/libexec/ld-elf.so.1: /usr/local/lib/compat/pkg/libstdc++.so.6: version GLIBCXX_3.4.9 required by /usr/local/bin/fbsetroot not found
/usr/local/bin/view_cam:8: warning: Insecure world writable dir /usr/sbin in PATH, mode 040777
Couldn't resolve name for AF_INET6: proxy
[VO_XV] It seems there is no Xvideo support for your video card available.
[VO_XV] Run 'xvinfo' to verify its Xv support and read
[VO_XV] DOCS/HTML/en/video.html#xv!
[VO_XV] See 'mplayer -vo help' for other (non-xv) video out drivers.
[VO_XV] Try -vo x11.
Shared memory error,disabling ( seg id error )
Shared memory error,disabling ( seg id error )
New_Face failed. Maybe the font path is wrong.
Please supply the text font file (~/.mplayer/subfont.ttf).
subtitle font: load_sub_face failed.
/libexec/ld-elf.so.1: /usr/local/lib/compat/pkg/libstdc++.so.6: version GLIBCXX_3.4.9 required by /usr/local/bin/fluxbox not found

Which package do I need to reinstall to get libstdc++.so.6?

[Carpetsmoker]

Right now the system is trying to use:

/usr/local/lib/compat/pkg/libstdc++.so.6

Which is in the compat directory, this is for legacy libraries to run binaries fro previous releases (FreeBSD 5, 4, etc.).
Maybe the original went missing?

Which package do I need to reinstall to get libstdc++.so.6?

It's part of the FreeBSD OS, you don't install it with a package.

Also take note of:

warning: Insecure world writable dir /usr/sbin in PATH, mode 040777

Is this the same machine that crashed and the save-entropy problems? If so, there seem to be some filesystem issues.
I would:
- fsck all filesystems.
- Use smartmontools to make sure the disks are fine.
- If there are still problems, reinstall the FreeBSD base and packages to make sure any missing files are reinstalled. (You can use pkg_info -g, see pkg_info(1)).