ENH: fallback to pip if matrix dependency is not available with conda
ENH: fallback to pip if matrix dependency is not available with conda

airspeed-velocity/asv,spacetelescope/asv,pv/asv,qwhelan/asv,spacetelescope/asv,airspeed-velocity/asv,qwhelan/asv,spacetelescope/asv,mdboom/asv,mdboom/asv,mdboom/asv,spacetelescope/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,pv/asv,airspeed-velocity/asv,pv/asv,pv/asv,mdboom/asv