A new version of caver is available (0.99.4). I tested it in my portage overlay without any issue. A patch is necessary. I created an ebuild that build caver 0.99.4 and apply the patch.
Created attachment 94551 [details, diff] patch for ebuild caver-0.99.4
Created attachment 94552 [details, diff] patch file to caver-0.99.4
I will take care of this shortly.
Added to Portage with modifications (added pdb2caver script and man page). Thanks for your work.