These files produce executable "md"
make default 
calls Makefile.f77 .  This should work for any standard f77 
compiler called f77, with exception of accounting cpu time which 
is substituted by  a “dumb” subroutine (substitute your own counter of 
cpu time in file  cpu_dummy.f)
make linux
or
make gfortran
calls  Makefile.gfortran. This can be  used  on Linux or other systems 
with gfortran fortran  
make intel
calls  Makefile.ifort. This can be  used  on Linux with free (at 
least now) Intel compiler ifort. Performance options, such as 
-xP for processors with sse3-instructions, may substantially 
speed up the program.
make pgi
calls Makefile.pgi  Calls Portland Group Fortran compiler pgi.
make static
calls Makefile.static  Creates static executable using gfortran compiler