That is 10gic's Vanitygen-plusplus right?
Tip for that fork: For real-world usage, use -F compressed for it to generate compressed WIF private key format,
the uncompressed form (although valid) is already deprecated and will produce quite higher transaction input size than the former.
Yes, I used the forked version, since the original repo isn't maintained anymore. Thanks for the tip, I'll remember to use it when I run vanitygen++ again

. I am still exploring new options.....
SegFault" is so generic that you'll never know the cause without looking at logs, code and OS to pinpoint the cause.
It's better to report it to its GitHub repository as a new issue.
I googled it a bit to understand what this error was. Looks like it's related to the OS not the program, not sure! Anyway, I'll report it, when i get the time.