undefined reference to `foo()'

[Gengis Kanhg Toledo Ramírez]

$ more *.cc *.h
::::::::::::::
foo.cc
::::::::::::::
#include "foo.h"

int foo()
{
     return 42;
}
::::::::::::::
main.cc
::::::::::::::
#include "foo.h"

int main()
{
     return foo();
}
::::::::::::::
foo.h
::::::::::::::
int foo();

$ g   ./main.cc -o prueba
/home/<myname>/tmp/ccEOfejM.o(.text 0x11): In function
`main':
: undefined reference to `foo()'
collect2: ld returned 1 exit status


 
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