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hi, I kinda feel that it's the first time you try to build/compile something ?

you certainly need to install all the build-dependencies found strictly necessary; on debian (and derivatives) this means installing a bunch of -dev suffixed deb packages.

you may lokk after the debian/control file for all those names; I'll put them now below to help you out:

Build-Depends:
  qt6-base-dev, qt6-base-dev-tools, qt6-tools-dev, qt6-tools-dev-tools,
  qt6-l10n-tools, qt6-svg-dev | libqt6svg6-dev,
  libjack-dev | libjack-jackd2-dev, libasound2-dev,
  libsndfile-dev, libvorbis-dev, libmad0-dev, libz-dev,
  libsamplerate-dev, librubberband-dev, libfftw3-dev, libaubio-dev,
  ladspa-sdk, dssi-dev, liblo-dev,
  lv2-dev, liblilv-dev, libsratom-dev, libsord-dev, libserd-dev,
  libgtk2.0-dev, libgtkmm-2.4-dev

the are the essential, make sure to install all the respective dependencies (the package manager may suggest for you).
hth.
cheers