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

Provides :
gtkmm30-doc

Requires :

glibmm24-doc
gtkmm30 = 3.8.1-3.el7
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1

Content of RPM :
/usr/share/devhelp
/usr/share/devhelp/books
/usr/share/devhelp/books/gtkmm-3.0
/usr/share/devhelp/books/gtkmm-3.0/gtkmm-3.0.devhelp2
/usr/share/doc/gtkmm-3.0
/usr/share/doc/gtkmm-3.0/images
/usr/share/doc/gtkmm-3.0/images/gtkmm_logo.gif
/usr/share/doc/gtkmm-3.0/images/top.gif
/usr/share/doc/gtkmm-3.0/reference
/usr/share/doc/gtkmm-3.0/reference/gtkmm-3.0.tag
/usr/share/doc/gtkmm-3.0/reference/html
/usr/share/doc/gtkmm-3.0/reference/html/aboutdialog1.png
/usr/share/doc/gtkmm-3.0/reference/html/annotated.html
/usr/share/doc/gtkmm-3.0/reference/html/arrow1.png
/usr/share/doc/gtkmm-3.0/reference/html/bc_s.png
/usr/share/doc/gtkmm-3.0/reference/html/bdwn.png
/usr/share/doc/gtkmm-3.0/reference/html/button2.png
/usr/share/doc/gtkmm-3.0/reference/html/calendar1.png
/usr/share/doc/gtkmm-3.0/reference/html/checkbutton1.png
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1AppLaunchContext-members.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1AppLaunchContext.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Color-members.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Color.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Cursor-members.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Cursor.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Device-members.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Device.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1DeviceManager-members.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1DeviceManager.html
/usr/share/doc/gtkmm-3.0/reference/html/classGdk_1_1Display-members.html
There is 868 files more in these RPM.