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+.TH ACL_SET_COMPAT 3
+.SH NAME
+acl_set_compat \- set compatibility mode for ACL library
+.SH SYNOPSIS
+.B #include <acl/acl.h>
+.PP
+.B void acl_set_compat(acl_compat_t compat_bits);
+.SH DESCRIPTION
+.I acl_set_compat
+sets the compatibility mode for various IRIX and Linux ACL functionality.
+The ACL semantics for IRIX even though they are based on the Posix 1003.1e 
+withdrawn ACL standard, are subtly different from the semantics of
+ext2 ACLs and BSD ACLs. The default semantics used are that of the ext2
+Posix ACLs and a call to this function should only be made to gain
+IRIX compatibility.
+.PP
+\f2Compat_bits\f1 is a bit-vector formed by or'ing compatiblity macros
+with the prefix of \f2ACL_COMPAT_\f1. Each call to this function will
+add to the current compatibility vector. Given a \f2compat_bits\f1 value
+of zero will reset it.
+If \f2compat_bits\f1 is set to \f2ACL_COMPAT_IRIXGET\f1 then the semantics for 
+.BR acl_get_fd (8)
+and
+.BR acl_get_file (8)
+are changed in the cases where no ACL was ever explicitly set for
+a file or directory.
+Please refer to
+.BR acl_get_fd (8)
+and
+.BR acl_get_file (8)
+for a description of the differing semantics.
+.SH SEE ALSO
+.BR acl_get_fd (8),
+.BR acl_get_file (8).