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You will likely need to set the following env variables to point to your VS 2017 installation, since Microsoft no longer sets such variables. This presumes that:

• You installed JDK 11 13 in C:\Program Files\Java\jdk-1113.
• You installed the Community edition of Visual Studio 2017 in C:\Program Files (x86)\Microsoft Visual Studio\2017\Community. If this isn't set correctly, you might see an error during the build saying that vcvars32.bat is missing.
• The folder name under C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC is 14.11.25503. If this isn't set correctly, you might  see an error during the :graphics:compileDecoraNativeShadersWin build task saying that cl.exe is missing. If you update VS, the folder name might change and you'll have to reconfigure the variable.

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export VS150COMNTOOLS="C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Auxiliary\\Build"
export JAVA_HOME="C:/Program Files/Java/jdk-1113"
export MSVC_VER=14.11.25503

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# for the active development stream, currently targeted for JDK 1213
hg clone http://hg.openjdk.java.net/openjfx/jfx-dev/rt

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