Required and optional dependencies don't provide lv2/lv2plug.in/ns/extensions/ui/ui.h
I have all required and optional dependencies installed but the file lv2/lv2plug.in/ns/extensions/ui/ui.h required by this line https://github.com/rncbc/synthv1/blob/master/CMakeLists.txt#L220 is still not found.
cmake is not the official build system nor it is yet recommended
I have all required and optional dependencies installed but the file
lv2/lv2plug.in/ns/extensions/ui/ui.hrequired by this line https://github.com/rncbc/synthv1/blob/master/CMakeLists.txt#L220 is still not found.
CMake works well for me (on Windows).
If you use Msys2 on Windows, you can consider my PKGBUILD for LV2 SDK.
Or if you use Linux distributions, consider following LV2's official build guide (Arch Linux/Manjaro can install package lv2 directly.)