add gw_data_find to configure.ac

configure.ac

@@ -270,6 +270,14 @@ AC_SUBST([MIN_LIGO_SEGMENTS_VERSION], [1.2.0])
 AX_PYTHON_LIGO_SEGMENTS([$MIN_LIGO_SEGMENTS_VERSION])
 
 
+#
+# Check for gw_data_find
+#
+
+
+AC_SUBST([MIN_GWDATAFIND_VERSION], [1.1.0])
+
+
 #
 # Check for gstlal
 #