Environment

• SuperCollider version: 3.10.2
• Operating system: Kubuntu 18.04
• Other details (Qt version, audio driver, etc.): Qt version 5.9.5, sc3-plugins 3.10.

Steps to reproduce

I don't know how to do that. SC worked well, scsynth started also. But one day (maybe after Ubuntu updates) it returns error on launching.

Actual behavior

I built sc with these scripts sc and sc3-plugins.
I start scide. It start interpreter and not start scsynth with error:

*** Welcome to SuperCollider 3.10.2. *** For help press Ctrl-D.
Booting server 'localhost' on address 127.0.0.1:57110.
SCDoc: Indexing help-files...
Server 'localhost' exited with exit code 0.
SCDoc: Indexed 1923 documents in 1.1 seconds

then I start 'scsynth' at konsole and it works in konsole without starting at scide:

$ scsynth -u 57110 -U "/usr/local/share/SuperCollider/Extensions/SC3plugins/"
JackDriver: client name is 'SuperCollider'
SC_AudioDriver: sample rate = 44100.000000, driver's block size = 1024
SuperCollider 3 server ready.
Zeroconf: registered service 'SuperCollider'

For example with flag -DCMAKE_BUILD_TYPE=Release within building scsynth didn't start at konsole also.

Before this state of error there was other ones. I launched the issue at sc3-plugins repo where you can see all attempts to fix it. I opened it there because of scide returned

Faust: supercollider.cpp: sc_api_version = 3
Faust: FaustGreyholeRaw numControls=7

But then it stopped to do it.
Also, scsynth started if I had deleted sc3-plugins or no installed them. Now scsynth doesn't start neither with sc3 or without them.

Expected behavior

I expect scsynth will be started during scide launching.