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Xorg 1.20 is planned for RHEL 7.6 and tigervnc needs to be rebuild, including some minor tweaks to build.
Fixed with tigervnc-1.8.0-6.el7.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:3059