Closed issue by userabc123xyz on void-packages repository

https://github.com/void-linux/void-packages/issues/25015

Description:
I'm trying to compile synthv1 on Void, and ./configure gives me: 
configure: WARNING: *** JACK library not found.
configure: WARNING: *** LV2 header files not found.

1) I already have libjack installed on my system - is this the correct package, or some devel package is also required?
2) I have no idea what package can provide LV2 headers

can someone help?