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Have you set the _BASE_DIR variables ?
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Contents of setup script I use:

C:\Development>type set_dirs.bat
rem Let CMake determine the library download directory name under
rem WIRESHARK_BASE_DIR or set it explicitly by using WIRESHARK_LIB_DIR.
rem Set *one* of these.
set WIRESHARK_BASE_DIR=C:\Development
rem set WIRESHARK_LIB_DIR=c:\wireshark-win64-libs
rem Set the Qt installation directory
set QT5_BASE_DIR=C:\qt\5.14.2\msvc2017_64
rem Append a custom string to the package version. Optional.
rem set WIRESHARK_VERSION_EXTRA=-CDC_16562
set WIRESHARK_VERSION_EXTRA=-CDC_200911
C:\Development>