Compile the PPM library version 1.0.1 and 1.2.1 on Linux

COMPILE PPM 1.0
    1. compile vizing:
        1.1 vizing is written by older c++ standard, hence the latest version of g++ can't work,
                2.1 the g++ version 34 "g++34" is employed to compile the code.
    2. compile the metis library.
        2.1 the metis include the the ppm-1.0.1 has problem to compile, the error is related to __log2. The error message is "/usr/include/bits/mathcalls.h:145: note: previous declaration of ‘__log2’ was here". Hence, use the metis library download from the PPM, address: http://www.ppm-library.org/index.php/download
        2.2 replace the metis by metis4 and copy the library to "libmetis.a"
    3. install fftw3
        3.1 download fftw3 from : http://www.fftw.org/download.html
        3.2 unpack the fftw3 by: tar xvzf fftw-3*.tar.gz
        3.3 configure the fftw3 : ./configure
                3.4 make the fftw3  : make
                3.4 install the fftw3: sudo make install
                3.5 the detail procedure can see INSTALL
    3. compile the PPM library.
        3.1 set the file in Make.userprefs: change FC as the setting mpif90
                     e.g : FC:=/usr/bin/mpif90
        3.2 set the FFTWDIR ( check where the FFTW installed by the following command :
                         rpm -ql fftw )
             e.g : FC:=/home/tmsxh/fftw-3.3
        3.3 change the compiler flag in ppm_define.h
                3.4 in order to get the preporcessed source file of PPM libaray comment the following line                 in file "Makefile.static", the program will not remove the preporcessed fortran file.
                   #    @rm $(OBJ_DIR)/__$*.f
                the preprocessed fortran code are stored in folder
COMPLIE PPM 1.2
    1. install the metis libaray.
    2. configure the library before compile by: ./configure --enable-mpi=mpich2 FC=/usr/bin/mpif90 --enable-linux LDFLAGS=-L./metis4/lib
        2.1 –enable-mpi= mpich2 : specify the mpich2 is employed as mpi library;
        2.2 FC = /usr/bin/mpif90  : specify the fortran MPI compiler; the mpif90 need to configured, before compile the PPM library;
        2.3 LDFLAGS=                : specify the location of metis library and other library.
    3. compile the PPM library by : make
    4. install the PPm library by  : sudo make install   
        the install will copy the “include” library to: /usr/local/include/ppm 
                                           and “library” to : /usr/local/lib