  We review the question of quantum consistency of N=4 conformal supergravity
in 4 dimensions. The UV divergences and anomalies of the standard ("minimal")
conformal supergravity where the complex scalar $\phi$ is not coupled to the
Weyl graviton kinetic term can be cancelled by coupling this theory to N=4
super Yang-Mills with gauge group of dimension 4. The same turns out to be true
also for the "non-minimal" N=4 conformal supergravity with the action (recently
constructed in arXiv:1609.09083) depending on an arbitrary holomorphic function
$f(\phi)$. The special case of the "non-minimal" conformal supergravity with
$f= e^{2\phi}$ appears in the twistor-string theory. We show that divergences
and anomalies do not depend on the form of the function $f$ and thus can be
cancelled just as in the "minimal" $f=1$ case by coupling the theory to four
N=4 vector multiplets.
