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graphviz-ocaml-0:2.28.0-23.el7 run-requires exact version of ocaml (ocaml(runtime) = 4.00.0) but this one does not exist in RHEL-7 anymore because ocaml has been rebased to 4.00.1:

$ repoquery --repoid=rhel-7 --whatprovides 'ocaml(runtime)'
ocaml-runtime-0:4.00.1-1.el7.i686
ocaml-runtime-0:4.00.1-1.el7.x86_64

$ repoquery --repoid=rhel-7 --provides ocaml-runtime-0:4.00.1-1.el7.i686 |grep 'ocaml(runtime)'
ocaml(runtime) = 4.00.1

Please rebuild graphviz against current ocaml.

(In reply to comment #0)
Thanks, fixed in graphviz-2.28.0-24.el7