output DOT_PATH variable

diff --git a/config/arg_with_doxygen.m4 b/config/arg_with_doxygen.m4
index dccdd38..4a094cc 100644 (file)
--- a/config/arg_with_doxygen.m4
+++ b/config/arg_with_doxygen.m4
@@ -47,9 +47,11 @@ else
     enable_dot=no
   else
     enable_dot=yes
+    DOT_PATH=`dirname $DOT`
   fi
 fi
 
+AC_SUBST(DOT_PATH)
 AC_SUBST(enable_dot)
 AC_SUBST(enable_html_docs)
 AC_SUBST(enable_latex_docs)