When trying to build KDE, one of the dependencies is the pilot-link package. When the process gets to this point, the pilot-link package is downloaded, but the system halts when it tries to extract it. It will not proceed at this point. To verify the .tgz file integrity, I unpacked it manually and it seems to work properly. This being my first foray into Gentoo, I do not know anything about the .ebuild files to look for an error, or know if something on my end is not configured correctly, but since I am able to emerge other packages fine, it would appear to be a problem with the pilot-link package.
It certainly works here. Just how does the system halt? Can you abort emerge with ctrl+c? Or is it a lockup? Assuming it isn't, while emerge is halted, run top or some equivalent and look at what is using the cpu. Is it tar/gzip (which would make this case look like some sort of malformed untar command)? Anything else? Maybe there's an infinite loop somewhere (a semi-educated guess).
Created attachment 51217 [details] log of compile
