--- a/common/autoconf/configure.ac	Wed Jan 16 12:00:21 2013 -0800
+++ b/common/autoconf/configure.ac	Wed Jul 05 18:37:09 2017 +0200
@@ -83,6 +83,9 @@
 BASIC_SETUP_PATHS
 BASIC_SETUP_LOGGING
 
+# Check if it's a pure open build or if custom sources are to be used.
+JDKOPT_SETUP_OPEN_OR_CUSTOM
+
 # These are needed to be able to create a configuration name (and thus the output directory)
 JDKOPT_SETUP_JDK_VARIANT
 JDKOPT_SETUP_JVM_VARIANTS