The steps are still relevant and workable, but if you are doing a lot of customisation pathing or you just simply wish to tweak the parameters in the configuration file, here is my sample script. I got my information from the Message threads of LAMMPS http://lammps.sandia.gov/threads/msg12768.html
Here are my settings, amending the $SOURCE/lammps-30Mar10/src/MAKE/Makefile.Linux
# linux = RedHat Linux box, Intel icc, MPICH2, FFTW
SHELL = /bin/sh
# ---------------------------------------------------------------------
# compiler/linker settings
# specify flags and libraries needed for your compiler
CC = mpicc
CCFLAGS = -g -O -I/usr/local/fftw/include -DFFT_FFTW
DEPFLAGS = -M
LINK = mpicc
LINKFLAGS = -O
USRLIB = -lfftw -lmpi
LIB = -lstdc++ -lpthread
ARCHIVE = ar
ARFLAGS = -rc
SIZE = size
# ---------------------------------------------------------------------
# LAMMPS-specific settings
# specify settings for LAMMPS features you will use
# LAMMPS ifdef options, see doc/Section_start.html
LMP_INC = -DLAMMPS_GZIP
# MPI library, can be src/STUBS dummy lib
# INC = path for mpi.h, MPI compiler settings
# PATH = path for MPI library
# LIB = name of MPI library:wq
MPI_INC = -DMPICH_IGNORE_CXX_SEEK
MPI_PATH = -L/usr/mpi/intel/lib # where I store my openmpi binary and lib
MPI_LIB = -lmpi -lpthread
# FFT library, can be -DFFT_NONE if not using PPPM from KSPACE package
# INC = -DFFT_FFTW, -DFFT_INTEL, -DFFT_NONE, etc, FFT compiler settings
# PATH = path for FFT library
# LIB = name of FFT library
FFT_INC = -DFFT_FFTW
FFT_PATH = -L/usr/local/fftw/lib # I've put my fftw at /usr/local/fftw
FFT_LIB = -lfftw
.............
You can add further flags at CCFLAGS. See my other blog entry
