Ah, so that file is generated too

ext/Makefile.am

@@ -5,4 +5,4 @@ SUBDIRS = @EXT_SUBDIRS@
 noinst_LIBRARIES=libphpext.a
 
 libphpext.a: @EXT_LIBS@
-	$(top_srcdir)/scripts/mkextlib $@ $(SUBDIRS)
+	top_srcdir=$(top_srcdir) $(top_builddir)/scripts/mkextlib $@ $(SUBDIRS)

main/main.c

@@ -610,7 +610,7 @@ static void php_message_handler_for_zend(long message, void *data)
 #	if APACHE  /* log into the errorlog, since at this time we can't send messages to the browser */
 					char memory_leak_buf[512];
 
-					snprintf(memory_leak_buf,512,"Possible PHP4 memory leak detected (harmless):  %d bytes from %s:%d",t->size,t->filename,t->lineno);
+					snprintf(memory_leak_buf,512,"Possible PHP4 memory leak detected (harmless):  0x%0.8lX, %d bytes from %s:%d", (long) t, t->size, t->filename, t->lineno);
 #		if MODULE_MAGIC_NUMBER >= 19970831
 					aplog_error(NULL, 0, APLOG_ERR | APLOG_NOERRNO, GLOBAL(php3_rqst)->server, memory_leak_buf);
 #		else