X-Git-Url: http://www.project-moonshot.org/gitweb/?p=shibboleth%2Fcpp-opensaml.git;a=blobdiff_plain;f=doxygen.m4;h=9bda4f66e057f96e1bec7a3db25d46d2a84a5bd9;hp=e9c56c206493510607068f95d6f6c4e070246ac9;hb=a66e828b0836515824fe2c064e3f706ce7431825;hpb=fc99d3a2a4d6b5d39c59863b514132b234a44d4d

diff --git a/doxygen.m4 b/doxygen.m4
index e9c56c2..9bda4f6 100644
--- a/doxygen.m4
+++ b/doxygen.m4
@@ -51,6 +51,9 @@ AC_DEFUN([DX_FEATURE_xml],  OFF)
 AC_DEFUN([DX_FEATURE_pdf],  ON)
 AC_DEFUN([DX_FEATURE_ps],   ON)
 
+# Compatibility with older autoconf versions.
+m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AC_HELP_STRING]))])
+
 ## --------------- ##
 ## Private macros. ##
 ## --------------- ##