I'm trying to install OpenVAS on Red Hat Enterprise Linux 5.5. I've successfully run yum install openvas-client, but yum install openvas-server prints the following errors:

--> Finished Dependency Resolution
openvas-client-3.0.1-1.el5.art.i386 from installed has depsolving problems
  --> Missing Dependency: libopenvas_hg.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
openvas-client-3.0.1-1.el5.art.i386 from installed has depsolving problems
  --> Missing Dependency: libopenvas_nasl.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
openvas-client-3.0.1-1.el5.art.i386 from installed has depsolving problems
  --> Missing Dependency: libopenvas_omp.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
openvas-scanner-3.2-0.2.el5.art.i386 from atomic has depsolving problems
  --> Missing Dependency: net-snmp-utils is needed by package openvas-scanner-3.2-0.2.el5.art.i386 (atomic)
openvas-client-3.0.1-1.el5.art.i386 from installed has depsolving problems
  --> Missing Dependency: libopenvas_misc.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
openvas-scanner-3.2-0.2.el5.art.i386 from atomic has depsolving problems
  --> Missing Dependency: openldap-clients is needed by package openvas-scanner-3.2-0.2.el5.art.i386 (atomic)
openvas-client-3.0.1-1.el5.art.i386 from installed has depsolving problems
  --> Missing Dependency: libopenvas_base.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
Error: Missing Dependency: net-snmp-utils is needed by package openvas-scanner-3.2-0.2.el5.art.i386 (atomic)
Error: Missing Dependency: libopenvas_base.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
Error: Missing Dependency: libopenvas_hg.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
Error: Missing Dependency: libopenvas_nasl.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
Error: Missing Dependency: openldap-clients is needed by package openvas-scanner-3.2-0.2.el5.art.i386 (atomic)
Error: Missing Dependency: libopenvas_omp.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
Error: Missing Dependency: libopenvas_misc.so.3 is needed by package openvas-client-3.0.1-1.el5.art.i386 (installed)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.

Notice that each of the missing dependencies is followed by the words (installed) or the words (atomic) - for the name of the repository. When I try to install any of these sub-dependencies, the installation fails (either due to missing dependencies or since the rpm is already installed). For example, if I try to install a rpm for "libopenvas_hg.so.3", I get an error message indicating that it is already installed. Yet "libopenvas_hg.so.3" is listed as a missing dependency. Why? Do I need to uninstall all of the "missing" dependences first?