Could NOT find GLIB2 (missing: GLIB2_LIBRARY GLIB2_MAIN_INCLUDE_DIR. Trying to build Wireshark 3.0 on Windows.

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That's the correct build command for Wireshark 3.0, but we'll need to see the full output from the command. Please redirect the output to a text file, post the file on a public share and then post a link to it back here. You can redirect using the following:

cmake -G "Visual Studio 15 2017 Win64" ..\wireshark 2>&1 > cmakeout.txt

(I'll put this up here for future reference) Generate the build files
To use a different generator modify the -G parameter. cmake -G lists all the CMake supported generators, but only Visual Studio is supported for Wireshark builds.

C:\Development\wsbuild64>cmake -G
CMake Error: No generator specified for -G

Generators
* Visual Studio 16 2019        = Generates Visual Studio 2019 project files.
                                 Use -A option to specify architecture.
  Visual Studio 15 2017 [arch] = Generates Visual Studio 2017 project files.
                                 Optional [arch] can be "Win64" or "ARM".

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