1. copy original AENET lib and AENET src files to this directory (lib/aenet).
2. create src_modified by applying patch to src.
3. compile AENET library lib/aenet/lib.
4. compile AENET source lib/aenet/src_modified.
4. copy archives liblbfgs.a libaenet.a to parent directory (lib).
5. compile PIMD: compile/pimd.mpi.x with -Daenet flag on.