Add a Requires for graphviz-gd for RHEL/Centos < 5 since these systems do not have cairo support
Add a Requires for graphviz-gd for RHEL/Centos < 5 since
these systems do not have cairo support

pixelglow/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,jho1965us/graphviz,kbrock/graphviz,tkelman/graphviz,kbrock/graphviz,tkelman/graphviz,MjAbuz/graphviz,tkelman/graphviz,ellson/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,kbrock/graphviz,pixelglow/graphviz,kbrock/graphviz,ellson/graphviz,kbrock/graphviz,MjAbuz/graphviz,kbrock/graphviz,ellson/graphviz,pixelglow/graphviz,tkelman/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,jho1965us/graphviz,BMJHayward/graphviz,pixelglow/graphviz,ellson/graphviz,tkelman/graphviz,tkelman/graphviz,ellson/graphviz,jho1965us/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,jho1965us/graphviz,kbrock/graphviz,pixelglow/graphviz,kbrock/graphviz,jho1965us/graphviz,BMJHayward/graphviz,jho1965us/graphviz,tkelman/graphviz,MjAbuz/graphviz,jho1965us/graphviz,ellson/graphviz,kbrock/graphviz,tkelman/graphviz,ellson/graphviz,kbrock/graphviz,pixelglow/graphviz,ellson/graphviz,pixelglow/graphviz,pixelglow/graphviz,jho1965us/graphviz,BMJHayward/graphviz,tkelman/graphviz,ellson/graphviz,jho1965us/graphviz,kbrock/graphviz,MjAbuz/graphviz,tkelman/graphviz,tkelman/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,pixelglow/graphviz,ellson/graphviz,MjAbuz/graphviz,pixelglow/graphviz,BMJHayward/graphviz,ellson/graphviz,jho1965us/graphviz,jho1965us/graphviz,pixelglow/graphviz