png-devel and jpeg-devel

Hello I installed nagios ( a network monitoring program ) on a server running SuSE 7.2. The problem is I cannot get it to generate graphs for me as it complains it cannot find png-devel and jpeg-devel libraries on my system. I browsed through the rpm list but I cannot find any rpm package with similar names. What is the name of these packages on SuSE ? Thank you very much for your help Dovli