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

Provides :
mingw32(libgtksourceviewmm-3.0-0.dll)
mingw32-gtksourceviewmm3
mingw32-pkgconfig(gtksourceviewmm-3.0)

Requires :

mingw32(kernel32.dll)
mingw32(libatkmm-1.6-1.dll)
mingw32(libcairomm-1.0-1.dll)
mingw32(libgcc_s_dw2-1.dll)
mingw32(libgdkmm-3.0-1.dll)
mingw32(libgiomm-2.4-1.dll)
mingw32(libglib-2.0-0.dll)
mingw32(libglibmm-2.4-1.dll)
mingw32(libgobject-2.0-0.dll)
mingw32(libgtk-3-0.dll)
mingw32(libgtkmm-3.0-1.dll)
mingw32(libgtksourceview-3.0-1.dll)
mingw32(libpangomm-1.4-1.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/libgtksourceviewmm-3.0-0.dll
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/buffer.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completion.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completionactivation.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completioncontext.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completioninfo.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completionitem.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completionproposal.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completionprovider.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/completionwords.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/gutter.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/gutterrenderer.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/gutterrendererpixbuf.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/gutterrenderertext.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/init.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/language.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/languagemanager.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/mark.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/markattributes.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/markup.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/printcompositor.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private/buffer_p.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private/completion_p.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private/completionactivation_p.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private/completioncontext_p.h
/usr/i686-w64-mingw32/sys-root/mingw/include/gtksourceviewmm-3.0/gtksourceviewmm/private/completioninfo_p.h
There is 41 files more in these RPM.