Can't find compiled mxo files

[GeckoGB]

Hi,

I would like to compile only jit.gl.syphonserver.mxo, using XCode 9.2 on MacOS 10.12.6.
But despite "Build succedeed" message, there's no file "Jitter/Server/jit.gl.syphonserver/DerivedData/jit.gl.syphonserver/Build/Products/Debug/jit.gl.syphonserver.mxo"

find DerivedData/Jitter/Build/Products/Debug/

DerivedData/Jitter/Build/Products/Debug/
DerivedData/Jitter/Build/Products/Debug//Syphon.framework
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Headers
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Resources
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Syphon
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers/Syphon.h
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers/SyphonClient.h
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers/SyphonImage.h
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers/SyphonServer.h
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Headers/SyphonServerDirectory.h
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Resources
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Resources/English.lproj
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Resources/English.lproj/InfoPlist.strings
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Resources/Info.plist
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/A/Syphon
DerivedData/Jitter/Build/Products/Debug//Syphon.framework/Versions/Current

How can i have the mxo files compiled?

Thanks.