Unity 2021 LTS Server build changes.md

Unity has changes how to create server build in 2021

Building from script

replace:

if (serverBuild)
    buildOptions |= BuildOptions.EnableHeadlessMode;

with:

var options = new BuildPlayerOptions();
if (serverBuild)
    options.subtarget = (int)(serverBuild ? StandaloneBuildSubtarget.Server : StandaloneBuildSubtarget.Player),

Running in Editor

UNITY_SERVER might now be defined in editor

replace:

#if UNITY_SERVER

with:

#if !UNITY_EDITOR && UNITY_SERVER

replace:

#if !UNITY_SERVER

with:

#if UNITY_EDITOR || !UNITY_SERVER