diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index ffe732c..9c97e2b 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -200,14 +200,25 @@
 #endif
 
 
-#define ngx_realpath(p, r)       realpath((char *) p, (char *) r)
+#define ngx_realpath(p, r)       (u_char *) realpath((char *) p, (char *) r)
 #define ngx_realpath_n           "realpath()"
 #define ngx_getcwd(buf, size)    (getcwd((char *) buf, size) != NULL)
 #define ngx_getcwd_n             "getcwd()"
 #define ngx_path_separator(c)    ((c) == '/')
 
+
+#if defined(PATH_MAX)
+
+#define NGX_HAVE_MAX_PATH        1
 #define NGX_MAX_PATH             PATH_MAX
 
+#else
+
+#define NGX_MAX_PATH             4096
+
+#endif
+
+
 #define NGX_DIR_MASK_LEN         0