@ceanwang Sorry, but you are wrong. The FLTK test/CMakeLists.txt file does not use '../' in any way. The code you're seeing that uses the relative directory is generated by CMake. And since you're using the "Unix Makefiles" generator you're implicitly saying that you want to build with a Unix (POSIX) environment that allows '../' relative directory syntax.

As a proof, here's the relevant code that runs the fluid executable from CMake/FLTK-Functions.cmake:

      add_custom_command(
        OUTPUT "${basename}.cxx" "${basename}.h"
        COMMAND fluid -c ${CMAKE_CURRENT_SOURCE_DIR}/${src}
        DEPENDS ${src}
        MAIN_DEPENDENCY ${src}
      )

The key is the line COMMAND fluid -c ${CMAKE_CURRENT_SOURCE_DIR}/${src} which invokes the CMake target fluid to generate the .cxx and .h files from the .fl file. As you can clearly see there's no '../' in this cmake file (the code is in a macro). The execution code is definitely generated by CMake.

As I wrote before, please use a MinGW or MSYS terminal which should be available in your install. Here's a screenshot from my Windows 10 system:

I clicked on the icon labeled 'M2' (which stands for MSYS2) and you see the popup from which I selected Mingw-w64 64 bit to do the build in my environment (64 bit Windows) and this works flawlessly. You can be sure that I tested this! However, the menus may be different, depending how you installed the MinGW-w64 environment.

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