multiple definition of

I'm using Intel Fortran Compiler for Linux to recompile a program originally compiled by Compaq Visual Fortran.

A linking problem occurs.

------------------------------Detail-----------------------------------

1.o: In function `_unnamed_data$_'1.for:(.text+0x4080): multiple definition of `_unnamed_data$_'
5.o:5.for:(.text+0xe690): first defined here

2.o: In function `_unnamed_data$_':2.for:(.text+0x0): multiple definition of `_unnamed_data$_'
5.o:5.for:(.text+0xe690): first defined here

3.o: In function `_unnamed_data$_':3.for:(.text+0x43f0): multiple definition of `_unnamed_data$_'
5.o:5.for:(.text+0xe690): first defined here

4.o: In function `_unnamed_data$_':4.for:(.text+0x0): multiple definition of `_unnamed_data$_'
5.o:5.for:(.text+0xe690): first defined here

-----------------------------End---------------------------------------

Compiling with CVF passed. The program includes 31 *.for files. using command "ifort -c *.for"to compile every source file and get 31 *.o files.

But a problem occured when I am linking the *.o files to get "myapp".

I QUITE sure the program is OK. I waiting for your help. Thanks!