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

Provides :
application()
application(gtk3-demo.desktop)
application(gtk3-icon-browser.desktop)
application(gtk3-widget-factory.desktop)
gtk3-devel
gtk3-devel(x86-64)
pkgconfig(gail-3.0)
pkgconfig(gdk-3.0)
pkgconfig(gdk-broadway-3.0)
pkgconfig(gdk-wayland-3.0)
pkgconfig(gdk-x11-3.0)
pkgconfig(gtk+-3.0)
pkgconfig(gtk+-broadway-3.0)
pkgconfig(gtk+-unix-print-3.0)
pkgconfig(gtk+-wayland-3.0)
pkgconfig(gtk+-x11-3.0)

Requires :

/usr/bin/pkg-config
gtk3(x86-64) = 3.22.30-6.el8
libX11.so.6()(64bit)
libXcomposite.so.1()(64bit)
libXcursor.so.1()(64bit)
libXdamage.so.1()(64bit)
libXext.so.6()(64bit)
libXfixes.so.3()(64bit)
libXi.so.6()(64bit)
libXinerama.so.1()(64bit)
libXrandr.so.2()(64bit)
libatk-1.0.so.0()(64bit)
libatk-bridge-2.0.so.0()(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libcairo-gobject.so.2()(64bit)
libcairo.so.2()(64bit)
libepoxy.so.0()(64bit)
libfontconfig.so.1()(64bit)
libfreetype.so.6()(64bit)
libgailutil-3.so.0()(64bit)
libgdk-3.so.0()(64bit)
libgdk_pixbuf-2.0.so.0()(64bit)
libgio-2.0.so.0()(64bit)
libglib-2.0.so.0()(64bit)
libgmodule-2.0.so.0()(64bit)
libgobject-2.0.so.0()(64bit)
libgtk-3.so.0()(64bit)
libharfbuzz.so.0()(64bit)
libm.so.6()(64bit)
libm.so.6(GLIBC_2.2.5)(64bit)
libpango-1.0.so.0()(64bit)
libpangocairo-1.0.so.0()(64bit)
libpangoft2-1.0.so.0()(64bit)
libpthread.so.0()(64bit)
librt.so.1()(64bit)
libwayland-client.so.0()(64bit)
libwayland-cursor.so.0()(64bit)
libwayland-egl.so.1()(64bit)
libxkbcommon.so.0()(64bit)
pkgconfig(atk) >= 2.15.1
pkgconfig(atk-bridge-2.0)
pkgconfig(cairo) >= 1.14.0
pkgconfig(cairo-gobject) >= 1.14.0
pkgconfig(cairo-xlib)
pkgconfig(epoxy) >= 1.0
pkgconfig(fontconfig)
pkgconfig(gdk-3.0)
pkgconfig(gdk-pixbuf-2.0) >= 2.30.0
pkgconfig(gio-2.0) >= 2.49.4
pkgconfig(gio-unix-2.0) >= 2.49.4
pkgconfig(gtk+-3.0)
pkgconfig(pango)
pkgconfig(pangocairo)
pkgconfig(pangoft2)
pkgconfig(wayland-client) >= 1.9.91
pkgconfig(wayland-cursor) >= 1.9.91
pkgconfig(wayland-egl)
pkgconfig(wayland-protocols) >= 1.12
pkgconfig(x11)
pkgconfig(xcomposite)
pkgconfig(xcursor)
pkgconfig(xdamage)
pkgconfig(xext)
pkgconfig(xfixes)
pkgconfig(xi)
pkgconfig(xinerama)
pkgconfig(xkbcommon) >= 0.2.0
pkgconfig(xrandr)
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
rtld(GNU_HASH)

Content of RPM :
/usr/bin/gtk-builder-tool
/usr/bin/gtk-encode-symbolic-svg
/usr/bin/gtk-query-settings
/usr/bin/gtk3-demo
/usr/bin/gtk3-demo-application
/usr/bin/gtk3-icon-browser
/usr/bin/gtk3-widget-factory
/usr/include/gail-3.0
/usr/include/gail-3.0/libgail-util
/usr/include/gail-3.0/libgail-util/gail-util.h
/usr/include/gail-3.0/libgail-util/gailmisc.h
/usr/include/gail-3.0/libgail-util/gailtextutil.h
/usr/include/gtk-3.0
/usr/include/gtk-3.0/gdk
/usr/include/gtk-3.0/gdk/broadway
/usr/include/gtk-3.0/gdk/broadway/gdkbroadwaycursor.h
/usr/include/gtk-3.0/gdk/broadway/gdkbroadwaydisplay.h
/usr/include/gtk-3.0/gdk/broadway/gdkbroadwaymonitor.h
/usr/include/gtk-3.0/gdk/broadway/gdkbroadwayvisual.h
/usr/include/gtk-3.0/gdk/broadway/gdkbroadwaywindow.h
/usr/include/gtk-3.0/gdk/deprecated
/usr/include/gtk-3.0/gdk/deprecated/gdkcolor.h
/usr/include/gtk-3.0/gdk/gdk-autocleanup.h
/usr/include/gtk-3.0/gdk/gdk.h
/usr/include/gtk-3.0/gdk/gdkapplaunchcontext.h
/usr/include/gtk-3.0/gdk/gdkbroadway.h
/usr/include/gtk-3.0/gdk/gdkcairo.h
/usr/include/gtk-3.0/gdk/gdkconfig.h
/usr/include/gtk-3.0/gdk/gdkcursor.h
/usr/include/gtk-3.0/gdk/gdkdevice.h
There is 579 files more in these RPM.