diff --git a/Makefile.am b/Makefile.am
index e2005d4..ea83d5b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -214,6 +214,7 @@ EXTRA_DIST = \
 	ChangeLog \
 	Roadmap \
 	doc/susp_aaip_0_2.txt \
+	libisofs/aaip-os-dummy.c \
 	libisofs/aaip-os-linux.c \
 	libisofs/aaip-os-freebsd.c
 
diff --git a/libisofs/aaip-os-dummy.c b/libisofs/aaip-os-dummy.c
new file mode 100644
index 0000000..8058b6b
--- /dev/null
+++ b/libisofs/aaip-os-dummy.c
@@ -0,0 +1,93 @@
+
+/*
+
+ aaip-os-dummy.c
+
+ Idle placeholder for:
+ Arbitrary Attribute Interchange Protocol , system adapter for getting and
+ setting of ACLs and XFS-style Extended Attributes.
+
+ See aaip-os-linux.c for a real implementation of this interface.
+
+ To be included by aaip_0_2.c
+*/
+
+#include <ctype.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+
+/* ------------------------------ Getters --------------------------------- */
+
+/* Obtain the ACL of the given file in long text form.
+   @return          0 ACL support not enabled at compile time
+*/
+int aaip_get_acl_text(char *path, char **text, int flag)
+{
+ return(0);
+}
+
+
+/* Obtain the Extended Attributes and/or the ACLs of the given file in a form
+   that is ready for aaip_encode().
+   @return              1   ok
+*/
+int aaip_get_attr_list(char *path, size_t *num_attrs, char ***names,
+                       size_t **value_lengths, char ***values, int flag)
+{
+ *num_attrs= 0;
+ *names= NULL;
+ *value_lengths= NULL;
+ *values= NULL;
+ return(1);
+}
+
+
+/* ------------------------------ Setters --------------------------------- */
+
+
+/* Set the ACL of the given file to a given list in long text form.
+   @return              0 ACL support not enabled at compile time
+*/
+int aaip_set_acl_text(char *path, char *text, int flag)
+{
+ return(0);
+}
+
+
+/* Bring the given attributes and/or ACLs into effect with the given file.
+   @param flag          Bitfield for control purposes
+                        bit0= decode and set ACLs
+                        bit1= first clear all existing attributes of the file
+                        bit2= do not set attributes other than ACLs
+   @return              1 success (there was nothing to do)
+                       -6 support of xattr not enabled at compile time
+                       -7 support of ACL not enabled at compile time
+*/
+int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
+                       size_t *value_lengths, char **values, int flag)
+{
+ size_t i;
+
+ for(i= 0; i < num_attrs; i++) {
+   if(names[i] == NULL || values[i] == NULL)
+ continue;
+   if(names[i][0] == 0) { /* ACLs */
+     if(flag & 1)
+       return(-7);
+ continue;
+   }
+   /* Extended Attribute */
+   if(!(flag & 4))
+     return(-6);
+ }
+ if(flag & 2)
+   return(-6);
+ return(1);
+}
+
+
diff --git a/libisofs/aaip_0_2.c b/libisofs/aaip_0_2.c
index 44c0ad0..dab5705 100644
--- a/libisofs/aaip_0_2.c
+++ b/libisofs/aaip_0_2.c
@@ -2059,8 +2059,14 @@ ex:;
 #include "aaip-os-freebsd.c"
 
 #else
+#ifdef __linux
 
 #include "aaip-os-linux.c"
 
-#endif
+#else
+
+#include "aaip-os-dummy.c"
+
+#endif /* ! __linux */
+#endif /* ! __FreeBSD__ */
 
diff --git a/libisofs/aaip_0_2.h b/libisofs/aaip_0_2.h
index be24481..a8e9e03 100644
--- a/libisofs/aaip_0_2.h
+++ b/libisofs/aaip_0_2.h
@@ -483,7 +483,8 @@ int aaip_set_acl_text(char *path, char *text, int flag);
                        -3 error with setting ACL
                        -4 error with setting attribute
                        -5 error with deleting attributes
-
+                       -6 support of xattr not enabled at compile time
+                       -7 support of ACL not enabled at compile time
 */
 int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
                        size_t *value_lengths, char **values, int flag);
diff --git a/libisofs/node.c b/libisofs/node.c
index d9a71b0..17ab4ef 100644
--- a/libisofs/node.c
+++ b/libisofs/node.c
@@ -1631,7 +1631,7 @@ int iso_node_set_acl_text(IsoNode *node, char *acl_text, int flag)
     mode_t st_mode;
 
     st_mode = iso_node_get_permissions(node);
-    if (!(flag & 2)) { /* want to update ACL by st_mode */
+    if (!(flag & 2)) { /* want not to update ACL by st_mode */
 
         /* >>> validate and rectify text */;