If you are compiling 0.5.4 with gcc-3.2, you will need to add the following to src/HostCacheConnection.cpp:
#include <iostream>

On the other hand, src/SHA1Storage.cpp fails to compile with:
SHA1Storage.cpp: In member function `QString* SHA1Storage::get(SharedFile*)':
SHA1Storage.cpp:103: no method `std::char_traits<char>::eos'

This is a problem because of the imgration from strstream to stringstream. I don't have a solution yet, though :-(

Yep... same problem here Gentoo 1.4.
That would probably explain why Gentoo's portage is still using 0.5.3

From the qtella-dev list:
--
As far as I can tell gcc 3.2 doesn't have an implementation for
std::string::traits_type::eos() in the libstdc++ library. There is an
implementation for std::string::traits_type::eof() which you can change
the line in SHA1Storage.cpp to. This will allow the build to complete.
However, all is still not right with the world as I get the following
errors when I run qtella:

WARNING: KLocale: trying to look up "" in catalouge. Fix the program
WARNING: KLocale: trying to look up "" in catalouge. Fix the program
WARNING: KLocale: trying to look up "" in catalouge. Fix the program
fcntl: Bad file descriptor
fcntl: Bad file descriptor

I'll investigate the KLocale warnings, but since I'm not a KDE guru
results aren't assured. As for the fcntl errors... these will require
more intimate knowlegde of the codebase which I really don't have.
---
HTH
Florian

eos() is a simple zero termination of the string needed for the later n.data() call I think

replace std::string::traits_type::eos()
with '\0'