Index: Modules/socketmodule.c
===================================================================
--- Modules/socketmodule.c	(revision 45544)
+++ Modules/socketmodule.c	(working copy)
@@ -61,6 +61,15 @@
 
 */
 
+#ifdef __APPLE__
+  /*
+   * inet_aton is not available on OSX 10.3, yet we want to use a binary
+   * that was build on 10.4 or later to work on that release, weak linking
+   * comes to the rescue.
+   */
+# pragma weak inet_aton
+#endif
+
 #include "Python.h"
 #include "structmember.h"
 
@@ -306,8 +315,13 @@
    older releases don't have */
 #undef HAVE_GETADDRINFO
 #endif
+
+#ifdef HAVE_INET_ATON
+#define USE_INET_ATON_WEAKLINK
 #endif
 
+#endif
+
 /* I know this is a bad practice, but it is the easiest... */
 #if !defined(HAVE_GETADDRINFO)
 /* avoid clashes with the C library definition of the symbol. */
@@ -3308,7 +3322,9 @@
 #endif
 #ifdef HAVE_INET_ATON
 	struct in_addr buf;
-#else
+#endif
+
+#if !defined(HAVE_INET_ATON) || defined(USE_INET_ATON_WEAKLINK)
 	/* Have to use inet_addr() instead */
 	unsigned long packed_addr;
 #endif
@@ -3319,6 +3335,10 @@
 
 
 #ifdef HAVE_INET_ATON
+
+#ifdef USE_INET_ATON_WEAKLINK
+    if (inet_aton != NULL) {
+#endif
 	if (inet_aton(ip_addr, &buf))
 		return PyString_FromStringAndSize((char *)(&buf),
 						  sizeof(buf));
@@ -3327,7 +3347,14 @@
 			"illegal IP address string passed to inet_aton");
 	return NULL;
 
-#else /* ! HAVE_INET_ATON */
+#ifdef USE_INET_ATON_WEAKLINK
+   } else {
+#endif
+
+#endif
+
+#if !defined(HAVE_INET_ATON) || defined(USE_INET_ATON_WEAKLINK)
+
 	/* special-case this address as inet_addr might return INADDR_NONE
 	 * for this */
 	if (strcmp(ip_addr, "255.255.255.255") == 0) {
@@ -3344,7 +3371,12 @@
 	}
 	return PyString_FromStringAndSize((char *) &packed_addr,
 					  sizeof(packed_addr));
+
+#ifdef USE_INET_ATON_WEAKLINK
+   }
 #endif
+
+#endif
 }
 
 PyDoc_STRVAR(inet_ntoa_doc,
Index: Modules/timemodule.c
===================================================================
--- Modules/timemodule.c	(revision 45544)
+++ Modules/timemodule.c	(working copy)
@@ -5,6 +5,17 @@
 #include "structseq.h"
 #include "timefuncs.h"
 
+#ifdef __APPLE__
+#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
+    /* 
+     * We don't need both gettimeofday and ftime, it is impossible that
+     * the former will fail and if we don't link to the latter a binary
+     * for OSX 10.4 will work on 10.3 as well.
+     */
+# undef HAVE_FTIME
+#endif
+#endif
+
 #include <ctype.h>
 
 #include <sys/types.h>
@@ -842,6 +853,7 @@
 			return (double)t.tv_sec + t.tv_usec*0.000001;
 #endif /* !GETTIMEOFDAY_NO_TZ */
 	}
+
 #endif /* !HAVE_GETTIMEOFDAY */
 	{
 #if defined(HAVE_FTIME)
Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 45544)
+++ Modules/posixmodule.c	(working copy)
@@ -13,6 +13,18 @@
 
 /* See also ../Dos/dosmodule.c */
 
+#ifdef __APPLE__
+   /*
+    * Step 1 of support for weak-linking a number of symbols existing on 
+    * OSX 10.4 and later, see the comment in the #ifdef __APPLE__ block
+    * at the end of this file for more information.
+    */
+#  pragma weak lchown
+#  pragma weak statvfs
+#  pragma weak fstatvfs
+
+#endif /* __APPLE__ */
+
 #define PY_SSIZE_T_CLEAN
 
 #include "Python.h"
@@ -8262,6 +8274,45 @@
 	PyModule_AddObject(m, "statvfs_result",
 			   (PyObject*) &StatVFSResultType);
 	initialized = 1;
+
+#ifdef __APPLE__
+	/*
+	 * Step 2 of weak-linking support on Mac OS X.
+	 *
+	 * The code below removes functions that are not available on the
+	 * currently active platform. 
+	 *
+	 * This block allow one to use a python binary that was build on
+	 * OSX 10.4 on OSX 10.3, without loosing access to new APIs on 
+	 * OSX 10.4.
+	 */
+#ifdef HAVE_FSTATVFS
+	if (fstatvfs == NULL) {
+		if (PyObject_DelAttrString(m, "fstatvfs") == -1) {
+			return;
+		}
+	}
+#endif /* HAVE_FSTATVFS */
+
+#ifdef HAVE_STATVFS
+	if (statvfs == NULL) {
+		if (PyObject_DelAttrString(m, "statvfs") == -1) {
+			return;
+		}
+	}
+#endif /* HAVE_STATVFS */
+
+# ifdef HAVE_LCHOWN
+	if (lchown == NULL) {
+		if (PyObject_DelAttrString(m, "lchown") == -1) {
+			return;
+		}
+	}
+#endif /* HAVE_LCHOWN */
+
+
+#endif /* __APPLE__ */
+
 }
 
 #ifdef __cplusplus