Hi,

at the moment the installation of Postgis is not possible for CentOS when using the pgdg10 repo.
The problem is that SFCGAL is not part of the repository:

        Error: Package: postgis24_10-2.4.0-1.rhel7.x86_64 (pgdg10-updates-testing)
                   Requires: libSFCGAL.so.1()(64bit)
        Error: Package: postgis24_10-2.4.0-1.rhel7.x86_64 (pgdg10-updates-testing)
                   Requires: SFCGAL

The same problem occurred for the 9.4 release in June ->  see message with id 1496751018.3997581.1000314744.4C279EDF@webmail.messagingengine.com
I checked that only for the x86_64 architecture. PPC64le should work (there is a SFCGAL rpm in the repo), but I am not sure about i386...

Regards,
Niko Krismer