The package xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 from the CR repository requires curl >= 7.15.5-9.el5_7.4, which isn't available.
The most recent version of curl I see is 7.15.5-9.el5_6.3, also in the CR repository.
Setting up Upgrade Process Resolving Dependencies --> Running transaction check ---> Package xmlrpc-c-client.i386 0:1.16.24-1206.1840.el5_7.4 set to be updated --> Processing Dependency: xmlrpc-c = 1.16.24-1206.1840.el5_7.4 for package: xmlrpc-c-client --> Processing Dependency: curl >= 7.15.5-9.el5_7.4 for package: xmlrpc-c-client --> Running transaction check ---> Package xmlrpc-c.i386 0:1.16.24-1206.1840.el5_7.4 set to be updated ---> Package xmlrpc-c-client.i386 0:1.16.24-1206.1840.el5_7.4 set to be updated --> Processing Dependency: curl >= 7.15.5-9.el5_7.4 for package: xmlrpc-c-client --> Finished Dependency Resolution xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 from cr has depsolving problems --> Missing Dependency: curl >= 7.15.5-9.el5_7.4 is needed by package xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 (cr) Error: Missing Dependency: curl >= 7.15.5-9.el5_7.4 is needed by package xmlrpc-c-client-1.16.24-1206.1840.el5_7.4.i386 (cr)