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The initial build process that generates the needed resources is done by the buildSrc folder. On Windows, it tries to locate all the needed tools and write their paths to the build\windows_tools.properties file. If it fails, the file is left blank, which results in a fatal error. In this case, define the VSCOMNTOOLS variable (older versions of JavaFX used VS150COMNTOOLS) to point to the VC\Auxiliary\Build directory in your Visual studio Installation. For example, use the following if you installed Visual Studio 2022 on the D: drive.

export VSCOMNTOOLS="D:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Auxiliary\\Build"

Note the use of the double backslash in the the VSCOMNTOOLS env var. This is needed because the cygwin shell uses the '\' as an escape character.

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