dev-dotnet/glade-sharp-2.12.21 is missing and because of that it's resulting in conflicts with glade-sharp and gtk-sharp.
These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild NS ] sys-devel/automake-1.10.3-r2:1.10::gentoo [1.11.6-r2:1.11::gentoo, 1.15-r2:1.15::gentoo] 936 KiB [ebuild N ] gnome-base/gsettings-desktop-schemas-3.22.0::gentoo USE="-introspection" 0 KiB [ebuild N ] x11-themes/gnome-themes-standard-3.22.2::gentoo 0 KiB [ebuild NS ] app-text/docbook-xml-dtd-4.3-r1:4.3::gentoo [4.1.2-r6:4.1.2::gentoo, 4.2-r2:4.2::gentoo, 4.4-r2:4.4::gentoo] 82 KiB [ebuild N ] dev-dotnet/gtk-sharp-gapi-2.12.10:2::gentoo USE="-debug" 1601 KiB [ebuild N ] dev-dotnet/glib-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB [ebuild N ] dev-dotnet/mono-addins-1.0-r1::gentoo USE="-gtk" 537 KiB [ebuild N ] dev-dotnet/pango-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB [ebuild N ] dev-dotnet/atk-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB [ebuild NS ] x11-libs/gtk+-2.24.31-r1:2::gentoo [3.22.4:3::gentoo] USE="cups xinerama (-aqua) -examples -introspection {-test} -vim-syntax" ABI_X86="32 (64) (-x32)" 12506 KiB [ebuild N ] x11-themes/gtk-engines-adwaita-3.20.2::gentoo ABI_X86="(64) -32 (-x32)" 2812 KiB [ebuild N ] dev-dotnet/gdk-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB [ebuild N ] gnome-base/libglade-2.6.4-r2:2.0::gentoo USE="-static-libs {-test} -tools" ABI_X86="(64) -32 (-x32)" PYTHON_SINGLE_TARGET="-pypy -python2_7" PYTHON_TARGETS="-pypy -python2_7" 348 KiB [ebuild N ] dev-dotnet/gtk-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB [ebuild N ] dev-dotnet/glade-sharp-2.12.10:2::gentoo USE="-debug" 0 KiB Total: 15 packages (12 new, 3 in new slots), Size of downloads: 18818 KiB WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict: dev-dotnet/gtk-sharp:2 (dev-dotnet/gtk-sharp-2.12.21:2/2::gentoo, ebuild scheduled for merge) conflicts with ~dev-dotnet/gtk-sharp-2.12.10 required by (dev-dotnet/glade-sharp-2.12.10:2/2::gentoo, ebuild scheduled for merge) ^ ^^^^^^^
glade-sharp is now included in gtk-sharp.