I'm just beginning to play with Catalyst to create custom installcd images. I've started with the Gentoo releng spec files from svn://anonsvn.gentoo.org/releng/trunk/releases/weekly/specs/amd64. I managed to get through stage1-3 and installcd-stage1 without any trouble.
Running installcd-stage2-minimal dies when trying to run Genkernel with "ln: failed to create symbolic link `/usr/src/linux': No such file or directory". I hacked the kmerge.sh script to drop to a shell right after that happened and found that there was no /usr/src directory in the chroot. Doing a `mkdir -p /usr/src` right before the ln call, and everything seems to work out after that.
I'm assuming something probably went wrong in an earlier stage, but I don't know enough about Catalyst yet to know quite where to look.
I can post spec files if they'd help, but I'm using stock from SVN with just some version number's changed around. Does anyone have a guess where I might look, or is there any chance this might be a bug in the kmerge.sh script? I'm using catalyst-18.104.22.1686 at this point, but I may just give the -9999 build a try to see if that fixed the issue.