Comment # 2 on bug 1205038 from Ralf Habacker

At the openSUSE Factory build project
https://build.opensuse.org/project/show/openSUSE:Factory one see how this issue
has been solved.

In the gtkmm3 package for example there are explicit references to the related
pkgconfig files:

BuildRequires:  pkgconfig(atkmm-1.6) >= 2.24.2
BuildRequires:  pkgconfig(cairomm-1.0) >= 1.12.0
BuildRequires:  pkgconfig(epoxy) >= 1.2
BuildRequires:  pkgconfig(gdk-pixbuf-2.0) >= 2.35.5
BuildRequires:  pkgconfig(giomm-2.4) >= 2.54.0
BuildRequires:  pkgconfig(gtk+-3.0) >= 3.24.0
BuildRequires:  pkgconfig(pangomm-1.4) >= 2.38.2

and associated packages has been added:

$ osc ls openSUSE:Factory | grep mm[0-9]_
atkmm1_6
cairomm1_0
glibmm2_4
pangomm1_4