I had the same problem … it has todo with the gcc …
Go to the EQ10Q Website and download their binary installer … choose gcc5 when asked on installation. http://eq10q.sourceforge.net/?page_id=16
It will copy the files to /usr/local/lib/lv2 …
Depending on your Linux you might wanna copy the .lv2 folder of eq10q to the /usr/lib/lv2 folder and restart ardour