g77 Help Wanted?

[GAVELLE NOEL]

Hello,
 
I try to use g77 on linux, but there is a trouble to run 
fortran program.
 
I use in my school a running program, i put it on my 
home's  computer
 
There are two directories :   Source in which i put 
source files and Run 
 
i use a makefile (in Source directory)to compile and to link 
these two directories. 
i write make on the screen, there is no problem:  
make generates all files.o.
Then, i go in Run directory and i write scl (the file 
which allow to run program) but there is error  lines on the screen 
:
 
multiple definition of "_init"

multiple definition of "_start"

multiple definition of "_umoddi3"
 
and other messages of the same type.
 
the last error message is:
 
collect2:ld returned 1 exit status
 
Can you help?
 
thank you for all.
ÂÂ