diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index cfd58efee..5f9c76fc2 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,21 @@
+2003-08-12  Corinna Vinschen  <corinna@vinschen.de>
+
+	* include/sys/param.h (NBBY): Define if not defined.
+
+2003-08-12  Nicholas Wourms  <nwourms@netscape.net>
+
+	* include/sys/param.h (setbit): Add new bitmap related macro.
+	(clrbit): Likewise.
+	(isset): Likewise.
+	(isclr): Likewise.
+	(howmany): Add new counting/rounding macro.
+	(rounddown): Likewise.
+	(roundup): Likewise.
+	(roundup2): Likewise.
+	(powerof2): Likewise
+	(MIN): Add macro for calculating min.
+	(MAX): Add macro for calculating max.
+
 2003-08-09  Christopher Faylor  <cgf@redhat.com>
 
 	* include/cygwin/version.h: Bump DLL minor number to 3.
diff --git a/winsup/cygwin/include/sys/param.h b/winsup/cygwin/include/sys/param.h
index 5469cc70b..811b5ee56 100644
--- a/winsup/cygwin/include/sys/param.h
+++ b/winsup/cygwin/include/sys/param.h
@@ -53,4 +53,27 @@
 #define NULL            0L
 #endif
 
+#ifndef NBBY
+#define    NBBY 8
+#endif
+
+/* Bit map related macros. */
+#define    setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
+#define    clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
+#define    isset(a,i)  ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
+#define    isclr(a,i)  (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
+
+/* Macros for counting and rounding. */
+#ifndef howmany
+#define    howmany(x, y)   (((x)+((y)-1))/(y))
+#endif
+#define    rounddown(x, y) (((x)/(y))*(y))
+#define    roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
+#define    roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
+#define powerof2(x)    ((((x)-1)&(x))==0)
+
+/* Macros for min/max. */
+#define    MIN(a,b)    (((a)<(b))?(a):(b))
+#define    MAX(a,b)    (((a)>(b))?(a):(b))
+
 #endif