diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index a1e864b6d4..0b23f73167 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -115,6 +115,7 @@ extern int		lchown(const char *path, uid_t owner, gid_t group);
 
 extern int		mknod(const char *name, mode_t mode, dev_t dev);
 
+extern int		getpagesize(void);
 extern int      getdtablesize(void);
 extern long		sysconf(int name);
 extern long		fpathconf(int fd, int name);
diff --git a/src/bin/diffutils/config.h b/src/bin/diffutils/config.h
index 6f10c2b83b..c8bcf8b7fd 100644
--- a/src/bin/diffutils/config.h
+++ b/src/bin/diffutils/config.h
@@ -36,8 +36,6 @@
 # define DIR_TO_FD(Dir_p) -1
 #endif
 
-#define getpagesize() 4096
-
 /* Define if there is a member named d_ino in the struct describing directory
    headers. */
 #define D_INO_IN_DIRENT 1
@@ -422,7 +420,7 @@
 /* #undef HAVE_GETMNTINFO */
 
 /* Define to 1 if you have the `getpagesize' function. */
-/* #undef HAVE_GETPAGESIZE */
+#define HAVE_GETPAGESIZE 1
 
 /* Define to 1 if you have the `getpass' function. */
 /* #undef HAVE_GETPASS */
diff --git a/src/bin/gdb/libiberty/Jamfile b/src/bin/gdb/libiberty/Jamfile
index c45fc6ab8d..57a02b9e53 100644
--- a/src/bin/gdb/libiberty/Jamfile
+++ b/src/bin/gdb/libiberty/Jamfile
@@ -58,7 +58,6 @@ StaticLibrary <gdb>libiberty.a :
 	# me, but some of those should be provided by Haiku.
 	basename.c
 	clock.c
-	getpagesize.c
 	index.c
 	insque.c
 	mempcpy.c
diff --git a/src/system/libroot/posix/unistd/Jamfile b/src/system/libroot/posix/unistd/Jamfile
index b32db8acc3..fb5cca7a78 100644
--- a/src/system/libroot/posix/unistd/Jamfile
+++ b/src/system/libroot/posix/unistd/Jamfile
@@ -16,6 +16,7 @@ MergeObject posix_unistd.o :
 	fcntl.c
 	fork.c
 	getlogin.c
+	getpagesize.c
 	hostname.cpp
 	ioctl.c
 	link.c
diff --git a/src/system/libroot/posix/unistd/getpagesize.c b/src/system/libroot/posix/unistd/getpagesize.c
new file mode 100644
index 0000000000..5cc1bd7b13
--- /dev/null
+++ b/src/system/libroot/posix/unistd/getpagesize.c
@@ -0,0 +1,13 @@
+/* 
+** Copyright 2008, James Woodcock. All rights reserved.
+** Distributed under the terms of the MIT License.
+*/
+
+#include <unistd.h>
+#include <kernel/OS.h>
+
+int
+getpagesize(void)
+{
+	return B_PAGE_SIZE;
+}