there are two things noticed for UE4.23 on linux: 1)BuildPhysX.Automation.cs, if (TargetData.Platform == UnrealTargetPlatform.Mac) {return sym;} should change to UnrealTargetPlatform.Linux. 2) when enable RTTI on linux(ModleRules.cs) set bUseRTTI = true, the code will fail in link. test env is linux 14.04.