diff --git a/demo/demo.c b/demo/demo.c
index 6308db1..7a82db4 100644
--- a/demo/demo.c
+++ b/demo/demo.c
@@ -65,6 +65,11 @@ static char helptext[][80] = {
 #include <fcntl.h>
 #include <err.h>
 
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 /* ------------------------- from demo/tree.c ----------------------- */
 
 static void
diff --git a/demo/iso_read.c b/demo/iso_read.c
index 7b19ba2..9bbfe38 100644
--- a/demo/iso_read.c
+++ b/demo/iso_read.c
@@ -10,6 +10,12 @@
 
 #include "libisofs.h"
 
+
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 static void
 print_permissions(mode_t mode)
 {
diff --git a/demo/lsl.c b/demo/lsl.c
index 17659f7..92e02cb 100644
--- a/demo/lsl.c
+++ b/demo/lsl.c
@@ -13,6 +13,12 @@
 #include <stdlib.h>
 #include <limits.h>
 
+
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 /*
  * Little test program to test filesystem implementations.
  * 
diff --git a/libisofs/builder.c b/libisofs/builder.c
index 9635892..f35cf2f 100644
--- a/libisofs/builder.c
+++ b/libisofs/builder.c
@@ -21,6 +21,11 @@
 #include <limits.h>
 
 
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 
 void iso_node_builder_ref(IsoNodeBuilder *builder)
 {
diff --git a/libisofs/filesrc.c b/libisofs/filesrc.c
index 505b7d1..155eb4a 100644
--- a/libisofs/filesrc.c
+++ b/libisofs/filesrc.c
@@ -23,6 +23,11 @@
 #include <limits.h>
 
 
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 int iso_file_src_cmp(const void *n1, const void *n2)
 {
     int ret;
diff --git a/libisofs/fs_image.c b/libisofs/fs_image.c
index 9280b10..03fc04c 100644
--- a/libisofs/fs_image.c
+++ b/libisofs/fs_image.c
@@ -30,6 +30,11 @@
 #include <stdio.h>
 
 
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 /**
  * Options for image reading.
  * There are four kind of options:
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 59fb477..99dd1ae 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -4689,6 +4689,11 @@ int iso_local_set_attrs(char *disk_path, size_t num_attrs, char **names,
                         size_t *value_lengths, char **values, int flag);
 
 
+/* Default in case that the compile environment has no macro PATH_MAX.
+*/
+#define Libisofs_default_path_maX 4096
+
+
 /* --------------------------- Filters in General -------------------------- */
 
 /*
diff --git a/libisofs/node.c b/libisofs/node.c
index bd4b338..8d5480e 100644
--- a/libisofs/node.c
+++ b/libisofs/node.c
@@ -22,6 +22,12 @@
 #include <limits.h>
 #include <stdio.h>
 
+
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 struct dir_iter_data
 {
     /* points to the last visited child, to NULL before start */
diff --git a/libisofs/stream.c b/libisofs/stream.c
index 6991ff7..97e0ba4 100644
--- a/libisofs/stream.c
+++ b/libisofs/stream.c
@@ -17,6 +17,12 @@
 #include <limits.h>
 #include <stdio.h>
 
+
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 ino_t serial_id = (ino_t)1;
 ino_t mem_serial_id = (ino_t)1;
 ino_t cut_out_serial_id = (ino_t)1;
diff --git a/libisofs/tree.c b/libisofs/tree.c
index d1c6feb..d753d3b 100644
--- a/libisofs/tree.c
+++ b/libisofs/tree.c
@@ -25,6 +25,12 @@
 #include <stdio.h>
 #include <fnmatch.h>
 
+
+#ifndef PATH_MAX
+#define PATH_MAX Libisofs_default_path_maX
+#endif
+
+
 /**
  * Add a new directory to the iso tree.
  *