For a Java project, I wanted to give the Eclipse profiler a try. It didn’t work, because it was missing a library (open the “Error log” view to see such things)

The corresponding library - libstdc++-5, and old C++ library - is no longer available in Debian unstable, so you need to grab the package from lenny. It will install fine on unstable.

Things may or may not be different on other architectures.

[Update: But TPTP is far from stable for me. It freezes Eclipse pretty much all the time.]