prevent multiple includes

diff --git a/modules/src/alloc/alloc.h b/modules/src/alloc/alloc.h
index 612e6b8..50c789d 100644 (file)
--- a/modules/src/alloc/alloc.h
+++ b/modules/src/alloc/alloc.h
@@ -3,6 +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
 /*     PROGRAM'S INTERFACE TO MEMORY ALLOCATION ROUTINES               */
 
 /*     This file serves as the interface between the program and the
@@ -34,3 +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