prevent multiple includes

modules/src/alloc/alloc.h

@@ -3,8 +3,8 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
-#ifndef ALLOC_INCLUDED
-#define ALLOC_INCLUDED
+#ifndef __ALLOC_INCLUDED__
+#define __ALLOC_INCLUDED__
 /*	PROGRAM'S INTERFACE TO MEMORY ALLOCATION ROUTINES		*/
 
 /*	This file serves as the interface between the program and the
@@ -36,4 +36,4 @@ typedef struct _ALLOC_ {
 #define	st_free(ptr, phead, size)	(botch((char *)(ptr), size), \
 						_A_st_free(ptr, phead, size))
 #endif	BOTCH_FREE
-#endif ALLOC_INCLUDED
+#endif __ALLOC_INCLUDED__

modules/src/read_em/em_comp.h

@@ -3,6 +3,8 @@
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
 /* $Header$ */
+#ifndef __EMCOMP_INCLUDED__
+#define __EMCOMP_INCLUDED__
 
 struct e_arg {
 	int	ema_argtype;		/* type of this argument */
@@ -70,3 +72,4 @@ extern unsigned int
 	EM_lineno;
 extern int
 	EM_wordsize, EM_pointersize;
+#endif __EMCOMP_INCLUDED__

modules/src/system/system.h

@@ -3,6 +3,8 @@
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
 /* RCS: $Header$ */
+#ifndef __SYSTEM_INCLUDED__
+#define __SYSTEM_INCLUDED__
 
 struct _sys_fildes {
 	int o_fd;	/* UNIX filedescriptor */
@@ -42,3 +44,4 @@ extern File _sys_ftab[];
 
 /* system's idea of block */
 #define BUFSIZ	1024
+#endif __SYSTEM_INCLUDED__