Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
mingw32(libflatbuffers-25.1.24.dll)
mingw32-flatbuffers
mingw32-pkgconfig(flatbuffers)

Requires :

mingw32(kernel32.dll)
mingw32(libgcc_s_dw2-1.dll)
mingw32(libstdc++-6.dll)
mingw32(msvcrt.dll)
mingw32-crt
mingw32-filesystem >= 95
mingw32-pkg-config
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsZstd) <= 5.4.18-1

Content of RPM :
/usr/i686-w64-mingw32/sys-root/mingw/bin/flatc.exe
/usr/i686-w64-mingw32/sys-root/mingw/bin/libflatbuffers-25.1.24.dll
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/allocator.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/array.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/base.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/buffer.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/buffer_ref.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/code_generator.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/code_generators.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/default_allocator.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/detached_buffer.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/file_manager.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/flatbuffer_builder.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/flatbuffers.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/flatc.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/flex_flat_util.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/flexbuffers.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/grpc.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/hash.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/idl.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/minireflect.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/pch
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/pch/flatc_pch.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/pch/pch.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/reflection.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/reflection_generated.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/registry.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/stl_emulation.h
/usr/i686-w64-mingw32/sys-root/mingw/include/flatbuffers/string.h
There is 18 files more in these RPM.