sudo pacman -S --needed git cmake gcc qt5-base qt5-tools qt5-wayland qt5-x11extras libsndfile fftw libvorbis lame \
libsamplerate libogg wine stk fluidsynth fltk libgig carla jack2 sdl2-compat alsa-lib portaudio \
perl-list-moreutils perl-exporter-tiny perl-xml-parser lv2 lilv

    ...done installing? Next, clone the source code

Troubleshooting

Recent versions of arch-flavoured wine don't support 32-bit prefixes anymore due to using the new WoW64 system instead. This means that compiling LMMS with up-to-date wine unfortunately also doesn't include the necessary 32-bit windows host to use 32-bit VST plugins. You know this is happening if cmake complains winegcc fails to compile 32-bit binaries, please make sure you have 32-bit GCC libraries in the "VST plugin host" section. The issue for this is #8050 - also includes workarounds

Please feel free to add something!