Build 32-bit on 64-bit Ubuntu: installing ia32-libs does not include libstdc++

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http://askubuntu.com – Googled for a while but drawn a blank. Need to build 32-bit app on 64-bit Ubuntu. Realise that I need to install ia32-libs. I have done this and apt-get tells me it's already at the latest version. This link: http://packages.debian.org/squeeze/amd64/ia32-libs/filelist says that libstdc++ should be in /usr/lib32 It's not there! I have uninstalled, reinstalled (with force) ia32-libs. Any ideas? How can I get this critter on my box? Ta, Ben (HowTos)