TOPIC: Error building in UbuntuStudio 19.10

Hi, I've got this error trying to build in ubuntustudio 19.10:
sound_engine/voice.h:32:10: fatal error: Chorus.h: No such file or directory
32 | #include "Chorus.h"
| ^~~~~~~~~~


Thanks for this software!

Maybe you forgot to install the stk library? (libstk0-dev)

mmh... it's installed:
$ dpkg -s libstk0-dev
Package: libstk0-dev
Status: install ok installed
Priority: optional
Section: libdevel
Installed-Size: 527
Maintainer: Ubuntu Developers <This email address is being protected from spambots. You need JavaScript enabled to view it. >
Architecture: amd64
Multi-Arch: same
Source: stk
Version: 4.5.2+dfsg-5build1
Depends: librtaudio-dev (>= 4.0.11~), librtmidi-dev (>= 2.0.1~), libstk-4.5.0 (= 4.5.2+dfsg-5build1)
Description: Sound Synthesis Toolkit (development files)
The Sound Synthesis Toolkit is a C++ library with implementations
of several sound synthesis algorithms, starting from Frequency
Modulation, over Physical Modelling and others. It can be used
as a library, but it also provides some nice software synthesizers.
.
This package provides the development files for the sound synthesis toolkit.
Homepage: ccrma.stanford.edu/software/stk/
Original-Maintainer: Debian Multimedia Maintainers <This email address is being protected from spambots. You need JavaScript enabled to view it.>

Oh, now I've seen the note in README about problems:
"If you experience compiling issues related to RtMidi, Stk, or QCustomplot you can opt to use the
local copies that come with Polyphone by commenting out the related lines at the top of
`polyphone.pro`: " ...
I'll try it this way later. Thanks!!

I've been trying to build uncommenting (originaly were commented):
DEFINES += USE_LOCAL_RTMIDI
DEFINES += USE_LOCAL_STK
DEFINES += USE_LOCAL_QCUSTOMPLOT
and uncommenting only stk
Both builds give:
context/audiodevice.cpp:32:10: fatal error: jack.h: No such file or directory
32 | #include "jack.h"

I tried to build polyphone on openSuSE Tumbleweed.

qmake-qt5 && make

failed with the same error. After fixing it a similar problem with jack had to be fixed.

On openSuSE Tumbleweed a build succeed with the following sequence of actions:

1.: Run " qmake-qt5"
2.: Manually add "-isystem /usr/include/stk -isystem /usr/include/jack" add the end of INCPATH in Makefile
3.: Run "make"