amd64 "no such file or directory" error with Android and Skype

Using an amd64 debian (lenny and kubuntu jaunty) install I came across the least informative error message yet:

bash: adb: No such file or directory

and similarly for skype.

This appears to be due to not yet having installed the i36 compatibility libraries:

apt-get install ia32-libs

and it goes away.