the calculation of unneeded packages for jobs that have the
SOLVER_CLEANDEPS flag set.
+*SOLVER_ALLOWUNINSTALL*::
+Allow the solver to deinstall the matching installed packages if they get
+into the way of resolving a dependency. This is like the
+SOLVER_FLAG_ALLOW_UNINSTALL flag, but limited to a specific set of packages.
+
*SOLVER_JOBMASK*::
A mask containing all the above action bits.