ediff-version-control-packageediff-version-control-package is a variable defined in `
ediff-init.el'. Its value is
vcDocumentation: Version control package used. Currently, Ediff supports vc.el, rcs.el, pcl-cvs.el, and generic-sc.el. The standard Emacs interface to RCS, CVS, SCCS, etc., is vc.el. However, some people find the other two packages more convenient. Set this variable to the appropriate symbol: `rcs', `pcl-cvs', or `generic-sc' if you so desire. You can customize this variable.