diff --git a/configuration/configure.ac b/configuration/configure.ac
index ce41cae..5a7340c 100755
--- a/configuration/configure.ac
+++ b/configuration/configure.ac
@@ -119,8 +119,10 @@
 AC_PATH_PROG(DATE, date)
 AC_PATH_PROG(EXPR, expr)
 
+dnl Java stuff.
 AC_PROG_JAVA
 AC_CHECK_CLASS([org.apache.xml.resolver.apps.resolver])
+AC_CHECK_CLASS([net.sf.saxon.Transform])
 
 dnl We make heavy use of features specific to GNU make.
 AC_CACHE_CHECK([for GNU make], [ac_cv_path_MAKE],