> 
> First I compile my module, which links to several
> other modules. I get some error messages, which is not
> too seldom for me ;-) Then I fix this errors, or so I
> think. Then I do a make clean, to do it all over. But
> now, when I run make, I get these weird error
> messages:
> 
> "Undefined symbol [...] referenced from text segment"

You're probably using a function from a library, but not linking
against that library when you build your executable.  For example,
on my 1.5.2 box, if I compile and link

	#include <math.h>
	#include <stdio.h>

	int main()
	{
   	   return printf("%g\n", sqrt(13));
	}

with something like

	% cc -o foo foo.c

I'll get

	/tmp/ccSxBNbM.o: In function `main':
	/tmp/ccSxBNbM.o(.text+0xc): undefined reference to `sqrt'
	collect2: ld returned 1 exit status

because I haven't linked against the math library, where 'sqrt' lives.
But

	% cc -o foo foo.c -lm

works:

	% ./foo
	3.60555


David S.

>