Compilation Error for DEC Alpha CC compiler : I'm trying to compile source code, that from 2001, in Ubuntu 18.04.2 LTS. But, I got the errors below and actually don't know how I have to change the compiling code. Can you help me for compiling this code?

Suggested compilation part from the program

 
      SUGGESTED COMPILATION COMMAND LINE (FOR A DEC-ALPHA CC-COMPILER):
    
      cc -lm -fast -tune host -arch host -assume whole_program \
         -o mol_volume mol_volume.c
    
When I tried this code, errors; 

    cc: error: host: No such file or directory
    cc: error: host: No such file or directory
    cc: error: whole_program: No such file or directory
    cc: error: unrecognized command line option ‘-fast’; did you mean ‘-Ofast’?
    cc: error: unrecognized command line option ‘-tune’; did you mean ‘-mtune=’?
    cc: error: unrecognized command line option ‘-arch’; did you mean ‘-march=’?
    cc: error: unrecognized command line option ‘-assume’; did you mean ‘-msse’?

Then, I changed `-fast`, `-tune`, `-arch`, `-assume` flags with `-Ofast`, `-mtune=native`, `-march=native`, `-msse` then add the path the for the directory part of the errors. 

    cc -lm -Ofast -mtune=native -march=native -msse /mypath/ -o mol_volume mol_volume.c

Then, I got that error;

    mol_volume.c: In function ‘main’:
    mol_volume.c:235:10: warning: implicit declaration of function ‘gets’; did you mean ‘fgets’? [-Wimplicit-function-declaration]
       while( gets(s) ) {
              ^~~~
              fgets
    mol_volume.c:311:26: warning: format ‘%i’ expects argument of type ‘int’, but argument 2 has type ‘long int’ [-Wformat=]
        printf("WARNING: the %i-th atom of the pdb file %s has an unknown chemical type %s.\n",
                             ~^
                             %li
          i+1, pdb_name, atom_type);
          ~~~                  
    /usr/bin/ld: cannot find .: File format not recognized
    collect2: error: ld returned 1 exit status


You can access the source code via this link;
[Source Code][1]

Thank you.


***My PC info:*** 

**Operation System**: Ubuntu 18.04.2 LTS

**Kernel ver.:** 4.15.0-50-generic

**GCC ver.:** 7.4.0


  [1]: http://www.ks.uiuc.edu/Development/MDTools/molvolume/