Index: libdatrie-0.2.9/configure.ac
===================================================================
--- libdatrie-0.2.9.orig/configure.ac
+++ libdatrie-0.2.9/configure.ac
@@ -113,7 +113,8 @@ if test "x$enable_doxygen_doc" = "xyes";
   else
     AC_MSG_CHECKING([doxygen >= $DOXYGEN_REQ_VER])
     DOXYGEN_VER=$($DOXYGEN --version)
-    if expr $DOXYGEN_VER \< $DOXYGEN_REQ_VER > /dev/null; then
+    AS_VERSION_COMPARE($DOXYGEN_VER, $DOXYGEN_REQ_VER, [HAVE_DOXYGEN=0], [HAVE_DOXYGEN=1], [HAVE_DOXYGEN=1])
+    if [test "$HAVE_DOXYGEN" = "0"]; then
       AC_MSG_RESULT([$DOXYGEN_VER, no, documentation disabled])
       enable_doxygen_doc="no"
     else