  A recent study of Mejia-Rodriguez and Trickey [Phys. Rev. A 96, 052512
(2017)] showed that the deorbitalization procedure (replacing the exact
Kohn-Sham kinetic-energy density by an approximate orbital-free expression)
applied to exchange-correlation functionals of the meta-generalized gradient
approximation (MGGA) can lead to important changes in the results for molecular
properties. For the present work, the deorbitalization of MGGA functionals is
further investigated by considering various properties of solids. It is shown
that depending on the MGGA, common orbital-free approximations to the
kinetic-energy density can be sufficiently accurate for the lattice constant,
bulk modulus, and cohesive energy. For the band gap, calculated with the
modified Becke-Johnson MGGA potential, the deorbitalization has a larger impact
on the results.
