Libwnck-devel 2.16.0 - Libraries and headers for libwnck.

Libwnck (pronounced "libwink") is used to implement pagers, tasklists, and other such things. It allows applications to monitor information about open windows, workspaces, their names/icons, and so forth.

You should install the libwnck-devel package if you would like to compile applications that use libwnck. You don't need libwnck-devel just to use precompiled applications.