These are the packages that would be merged, in order:

Calculating dependencies... done!

!!! The ebuild selected to satisfy "app-text/mupdf" has unmet requirements.
- app-text/mupdf-1.14.0-r2::gentoo USE="X javascript opengl openssl static-libs vanilla -curl -libressl" ABI_X86="(64)"

  The following REQUIRED_USE flag constraints are unsatisfied:
    opengl? ( !static-libs )

  The above constraints are a subset of the following complete expression:
    opengl? ( !static-libs ) curl? ( X )

(dependency required by "net-print/cups-filters-1.20.4::gentoo[pdf]" [ebuild])
(dependency required by "net-print/cups-2.2.7::gentoo" [ebuild])
(dependency required by "net-wireless/bluez-5.50-r1::gentoo[cups]" [installed])
(dependency required by "dev-lang/python-2.7.15::gentoo[bluetooth]" [installed])
(dependency required by "dev-libs/libxml2-2.9.8::gentoo[python,python_targets_python2_7]" [ebuild])
(dependency required by "app-arch/libarchive-3.3.1::gentoo[-expat]" [ebuild])
(dependency required by "dev-util/cmake-3.9.6::gentoo" [installed])
(dependency required by "dev-libs/libical-2.0.0-r3::gentoo" [ebuild])

 * IMPORTANT: 17 news items need reading for repository 'gentoo'.