diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 4b7c859b7..53991e0b1 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,9 @@
+2001-08-13  Jeff Johnston  <jjohnstn@redhat.com>
+
+	* libc/include/malloc.h (M_MXFAST, M_NLBLKS, M_GRAIN, M_KEEP): New
+	macro constants for mallopt options.
+	(M_TRIM_THRESHOLD, M_TOP_PAD, M_MMAP_THRESHOLD, M_MMAP_MAX): Ditto.
+
 2001-08-02  Jeff Johnston  <jjohnstn@redhat.com>
 
 	* libc/include/stdio.h (BUFSIZ): Define to __BUFSIZ__ if provided,
diff --git a/newlib/libc/include/malloc.h b/newlib/libc/include/malloc.h
index 90f877f6f..5ccdda61c 100644
--- a/newlib/libc/include/malloc.h
+++ b/newlib/libc/include/malloc.h
@@ -75,6 +75,20 @@ extern int _malloc_trim_r _PARAMS ((struct _reent *, size_t));
 extern _VOID mstats _PARAMS ((char *));
 extern _VOID _mstats_r _PARAMS ((struct _reent *, char *));
 
+/* SVID2/XPG mallopt options */
+
+#define M_MXFAST  1    /* UNUSED in this malloc */
+#define M_NLBLKS  2    /* UNUSED in this malloc */
+#define M_GRAIN   3    /* UNUSED in this malloc */
+#define M_KEEP    4    /* UNUSED in this malloc */
+
+/* mallopt options that actually do something */
+  
+#define M_TRIM_THRESHOLD    -1
+#define M_TOP_PAD           -2
+#define M_MMAP_THRESHOLD    -3 
+#define M_MMAP_MAX          -4
+
 #ifndef __CYGWIN__
 /* Some systems provide this, so do too for compatibility.  */
 extern void cfree _PARAMS ((_PTR));