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Here are some steps you can take to fix a compilation error in dbusmessage.h with mingw via MSYS2:

1. Make sure you have the latest version of MSYS2 installed on your system.

2. Install the dbus package using pacman:

   pacman -S mingw-w64-x86_64-dbus
   

3. Make sure you have the necessary mingw packages installed, such as mingw-w64-x8664-gcc and mingw-w64-x8664-pkg-config.

4. Check if there are any missing dependencies and install them using pacman.

5. Make sure the correct header files are included in your code. Specifically, you may need to add #include <dbus/dbus.h> at the top of your file.

6. If you are still experiencing compilation errors, try rebuilding the package from source as follows:

   • Download the dbus source package from the official website
   • Extract the package to a directory, e.g. ~/dbus
   • Open a terminal and navigate to the extracted directory

   • Run the following commands:

     ./configure --host=x86_64-w64-mingw32 --prefix=/mingw64
     make
     make install
     

7. After rebuilding dbus, try compiling your code again. If you still encounter errors, review the error messages and search online for possible solutions.