Welcome to the xdrawchem wiki! Some quick notes:
RPM releases are now available from SourceForge. XDrawChem depends on OpenBabel, so be sure to install the EPEL repository. Typing "yum install epel-release" should work on CentOS and RedHat. Otherwise, see directions at https://fedoraproject.org/wiki/EPEL
XDrawChem depends on Qt-3.3 and OpenBabel. Be sure to install "devel" packages, e.g. "qt3-devel" and "openbabel-devel"