# Unreal Engine Defaults to Headless Mode

**URL:** <https://forums.unrealengine.com/t/unreal-engine-defaults-to-headless-mode/421245>\
**Category:** Platform & Builds\
**Tags:** compiling, UE4-19, Linux, unreal-engine, bug-report, CPP, question\
**Created:** [March 29, 2018, 6:02pm UTC](https://forums.unrealengine.com/t/unreal-engine-defaults-to-headless-mode/421245 "2018-03-29T18:02:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![cygon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@cygon](https://forums.unrealengine.com/u/cygon)\
**Post date:** [March 29, 2018, 6:18pm UTC](https://forums.unrealengine.com/t/unreal-engine-defaults-to-headless-mode/421245/2 "2018-03-29T18:18:47Z")

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It is the second of the two code locations I posted, `SDL_ShowMessageBox()`, that fails. The SDL function returns -1.

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