https://bugs.gentoo.org/702346
# emerge -auvDN world These are the packages that would be merged, in order: Calculating dependencies... done! !!! The ebuild selected to satisfy "dev-libs/libxslt" has unmet requirements. - dev-libs/libxslt-1.1.33-r1::gentoo USE="crypt python -debug -examples -static-libs" ABI_X86="(64) -32 (-x32)" PYTHON_TARGETS="-python2_7" The following REQUIRED_USE flag constraints are unsatisfied: python? ( python_targets_python2_7 ) The above constraints are a subset of the following complete expression: python? ( any-of ( python_targets_python2_7 ) ) (dependency required by "dev-util/glib-utils-2.62.6::gentoo" [installed]) (dependency required by "xfce-base/xfconf-4.14.1::gentoo" [installed]) (dependency required by "xfce-base/libxfce4ui-4.14.1::gentoo" [installed]) (dependency required by "xfce-base/exo-0.12.11::gentoo" [installed]) (dependency required by "x11-misc/lightdm-gtk-greeter-2.0.7-r1::gentoo" [installed]) (dependency required by "x11-misc/lightdm-1.30.0-r1::gentoo[gtk]" [ebuild]) (dependency required by "@selected" [set]) (dependency required by "@world" [argument])