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

Provides :
mingw32(libgtkspellmm-3.0-0.dll)
mingw32-gtkspellmm30
mingw32-pkgconfig(gtkspellmm-3.0)

Requires :

mingw32(kernel32.dll)
mingw32(libgcc_s_dw2-1.dll)
mingw32(libglib-2.0-0.dll)
mingw32(libglibmm-2.4-1.dll)
mingw32(libgobject-2.0-0.dll)
mingw32(libgtkmm-3.0-1.dll)
mingw32(libgtkspell3-3-0.dll)
mingw32(libsigc-2.0-0.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/libgtkspellmm-3.0-0.dll
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm/gtkspell.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm/init.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm/private
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm/private/gtkspell_p.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtkspellmm-3.0/gtkspellmm/wrap_init.h
/usr/i686-w64-mingw32/sys-root/mingw/lib/gtkspellmm-3.0
/usr/i686-w64-mingw32/sys-root/mingw/lib/gtkspellmm-3.0/include
/usr/i686-w64-mingw32/sys-root/mingw/lib/gtkspellmm-3.0/include/gtkspellmmconfig.h
/usr/i686-w64-mingw32/sys-root/mingw/lib/libgtkspellmm-3.0.dll.a
/usr/i686-w64-mingw32/sys-root/mingw/lib/pkgconfig/gtkspellmm-3.0.pc
/usr/share/licenses/mingw32-gtkspellmm30
/usr/share/licenses/mingw32-gtkspellmm30/COPYING