Since im not a programmer, i will not even try to add a flag to the code seperately so you will pretty much need to use the whole line i provided.
I only did this guide for windows, because im sure many GNU/Linux users will know how to use the vanitygen and compile.
First download the executable from HERE
Then extract the folder somewhere on your computer.
After that, edit the bat file and will look like this:
vanitygen.exe -X 68 UNF
pause
Do not change the anything apart from the "NF" part of the file, other ones are important parts.
If you example want to generate addy starting like "Uida" change the file to following:
vanitygen.exe -X 68 Uida
pause
Then just save the file, and run the bat file.
you should get something like this as output
Difficulty: 78508
Pattern: Uida
Address: UidaosTM7qLAZ6J1tH7M3ez7AnkF3PWPfH
Privkey: 7bUHXuuTWvCqoZfLqjkShSvhFLKoB47hfKzKcMtks3UyiGJTCuh
Then just copy the private key that you created, and go to your unify-qt -> help -> debug window -> console
then write the following line with your private key
importprivkey yourprivkeyhere
I hope many of you will find this information valuable
Edit: you cannot use the following characters in the pattern: 0 (zero), O (capital o), I (capital i) and l (lower case L) as well as the non-alphanumeric characters + (plus) and / (slash)