Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
graphviz-ruby
graphviz-ruby(x86-64)
libgv_ruby.so()(64bit)

Requires :

ruby
libc.so.6()(64bit)
libltdl.so.7()(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libxdot.so.4()(64bit)
libexpat.so.1()(64bit)
libgvc.so.6()(64bit)
libcrypt.so.1()(64bit)
rtld(GNU_HASH)
libstdc++.so.6()(64bit)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
librt.so.1()(64bit)
libpthread.so.0()(64bit)
graphviz = 2.30.1-22.el7
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libstdc++.so.6(GLIBCXX_3.4)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libm.so.6()(64bit)
libcdt.so.5()(64bit)
libruby.so.2.0()(64bit)
libpathplan.so.4()(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libgcc_s.so.1()(64bit)
libcgraph.so.6()(64bit)
libz.so.1()(64bit)
libdl.so.2()(64bit)

Content of RPM :
/usr/lib64/graphviz/ruby
/usr/lib64/graphviz/ruby/gv.so
/usr/lib64/graphviz/ruby/libgv_ruby.so
/usr/lib64/ruby/vendor_ruby
/usr/lib64/ruby/vendor_ruby/gv.so
/usr/share/man/man3/gv.3ruby.gz