UE4onUbuntu14.04

when i do:

make ShaderCompileWorker UnrealLightmass UnrealPak UE4Editor

after a while i get this error:

clang: error: unable to execute command: Killed
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 3.5.0-4ubuntu2~trusty2 (tags/RELEASE_350/final) (based on LLVM 3.5.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to http://bugs.debian.org/ and include the crash backtrace, preprocessed source, and associated run script.
[122/896] Compile Kismet.generated.cpp
[123/896] Link libUE4Editor-ReliabilityHandlerComponent.so
[124/896] Compile Module.Kismet.5_of_5.cpp
[125/896] Compile AIModule.generated.cpp
[126/896] Compile Module.HardwareSurvey.cpp
[127/896] Compile Module.DatabaseSupport.cpp
clang: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/Module-6637f9.cpp
clang: note: diagnostic msg: /tmp/Module-6637f9.sh
clang: note: diagnostic msg:

********************
...and at the end of compiling i get this:

ERROR: UBT ERROR: Failed to produce item: /home/ivo/UnrealEngine/Engine/Binaries/Linux/libUE4Editor-Kismet.so
Total build time: 3850,47 seconds
make: *** [UE4Editor] Error 5