Kerberos Credentials Manager is not built by default. I suggest to add the --enable-kcm option to econf in the ebuild in order to build this program by default since it is a useful tool and shouldn't hurt anybody.
Created attachment 85954 [details] ebuild for heimdal-0.7.2 with trivial change in order to build kcm
0.7.2-r1 has the kcm enabled. thanks!