Comment 6 for bug 990982

Will file a bug then.

alex@leon:~$ apt-cache policy gcc
gcc:
  Installed: 4:4.6.3-1ubuntu5
  Candidate: 4:4.6.3-1ubuntu5
  Version table:
 *** 4:4.6.3-1ubuntu5 0
        500 http://fr.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

alex@leon:~$ sudo apt-get install libc6-dev gcc libc6-dev:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
gcc is already the newest version.
libc6-dev is already the newest version.
The following extra packages will be installed:
  linux-libc-dev:i386
Suggested packages:
  glibc-doc:i386 manpages-dev:i386
Recommended packages:
  gcc:i386 c-compiler:i386
The following NEW packages will be installed:
  libc6-dev:i386 linux-libc-dev:i386
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 5,891 kB of archives.
After this operation, 23.0 MB of additional disk space will be used.
Do you want to continue [Y/n]? ^C

You seem to understand what's going wrong, and that's great !