[R] make: Nothing to be done for `all'.

[Elizabeth Lawson]

Why would I want to remove (rm) the file.  I am trying to compile it. 

For the file hello2.c
/* hello.c: display a message on the screen */

#include <stdio.h>

main()
{
	printf("hello, world\n");
}

I used gcc hello2.c and it works fine.

But fort eh file hello.c
#include <R.h> 
void hello(int *n) 
{ 
int i; 
for(i=0; i < *n; i++) { 
Rprintf("Hello, world!\n"); 
} 
} 


I try R CMD SHLIB hello.c and I ge tthe error 
make: Nothing to be done for `all'.

Why does one compile and the other not?
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