Hi, might it be an idea to add this to the page with instructions on building with vst support?
Make a symbolic link to your vst path:
$ sudo ln -s /home/[your-user-name]/vst /usr/lib/vst
Make sure that it is possible to read and write in your vst directory:
$ sudo chmod 777 vst/
I had issues because of this and had to search through some bug reports to find the answer.