Layman uses subversion, but the ebuild does not have a dependency for it.
Noticed that dev-util/subversion was removed the other day by emerge --depclean (and wasn't pulled back in by revdep-rebuild). Went to update layman (layman -S) and it complained about not being able to find /usr/bin/svn
Steps to Reproduce:
# layman -S
* Failed to sync overlay "science".
* Error was: Binary /usr/bin/svn seems to be missing! Overlay type "svn" not supported. Did you emerge dev-util/subversion?
layman should update all overlays.
*** This bug has been marked as a duplicate of bug 168203 ***