With the recent update of uw-imap from epel repository to uw-imap-2007d-1.el5, I was getting the below error which indicated that uw-imap required 2007d version of c-client.
Below was the error message as logged in "/var/log/messages":
IMAP toolkit crash: c-client library version skew, app=2007d library=2007b
Adding "libc-client2007" to the list of "includepkgs" in yum conf for epel repository and doing a `yum update` resolved the issue by updating libc-client2007-2007b to libc-client2007-2007d.