LMMS doesn't start

Having trouble with LMMS? Ask about it here.
Hello, I installed lmms 1.2.0-rc4 on my Arch machine via AUR repository. I'm not able to start it. Following output:
lmms
qt5ct: using qt5ct plugin
qt5ct: palette support is disabled
qt5ct: custom style sheet is disabled
VST sync support disabled in your configuration
VST_PATH not set, defaulting to /home/christian/vst:/usr/local/lib/vst:/usr/lib/vst
"Cannot load library /usr/lib/ladspa/ladspa_guitarix.so: (libboost_system.so.1.64.0: cannot open shared object file: No such file or directory)"
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 1
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 1
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 1
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 90
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 90
convoLV2: samplerate mismatch preset:48000 host:44100
prio = 0, offs = 0, parsize = 512, npar = 90
"Cannot load library /usr/lib/ladspa/ladspa_guitarix.so: (libboost_system.so.1.64.0: cannot open shared object file: No such file or directory)"
"Cannot load library /usr/lib64/ladspa/ladspa_guitarix.so: (libboost_system.so.1.64.0: cannot open shared object file: No such file or directory)"
[1] 29016 segmentation fault (core dumped) lmms
System: Linux 4.14.5-1-ARCH, Gnome3

Thanks!
Edited: Issue already reported.
It's already reported here I think: https://github.com/LMMS/lmms/issues/4030