Since OpenFOAM-3.0 it is the convention to put blockMeshDict into system instead of constant/polyMesh Having blockMeshDict in system is supported since OpenFOAM-2.3
Since OpenFOAM-3.0 it is the convention to put blockMeshDict into system instead of constant/polyMesh Having blockMeshDict in system is supported since OpenFOAM-2.3