ERSCH not found

[Kurt Gerber]

Hi 
Compiling grass5beta3 I get the following Error: 
Error in ...... ERSCH undeclared (first use in this function ) 
in different files like ...src/general/gis/lock.c and different others.
There was always the function:

find_process (int pid)
if (kill (pid, 0) == 0)
	return 1;
    return errno != ESRCH;

 Is this function important or can I comment out the line 
return errno!= ESRCH;    ?

Kurt