Unreal 4.22 compile

BuildConfiguration.xml

This is what worked for me on 4.22 on Linux (ubuntu 18.04)
Engine/Saved/UnrealBuildTool/BuildConfiguration.xml

    <?xml version="1.0" encoding="utf-8" ?>
     <Configuration xmlns="https://www.unrealengine.com/BuildConfiguration">
       <LocalExecutor>
         <MaxProcessorCount>8</MaxProcessorCount>
       </LocalExecutor>
     </Configuration>

notes

#unset EMSDK as Unreal ships with a version
set -e EMSDK

#set houdini Root
set -gx HFS /opt/hfs17.5.211

python notes

compile command:
env CC=/home/nan/p/UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v13_clang-7.0.1-centos7/x86_64-unknown-linux-gnu/bin/clang CXX=/home/nan/p/UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v13_clang-7.0.1-centos7/x86_64-unknown-linux-gnu/bin/clang++  CPPFLAGS="-fPIC" ./configure --enable-shared --enable-unicode=ucs2 --prefix=(pwd)/install

copy libpython2.7.so.* in Engine/Binaries/Linux

Python.Build.cs

			190: PythonIncludePath = Path.Combine(PythonRoot, "include", "python2.7");