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-rw-r--r--runtime/runtime.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 6fa168dc..756f8607 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -30,8 +30,12 @@
#include <linux/compat.h>
#include <linux/mm.h>
-/* the new transport requires debugfs and a newer relayfs */
-#if !defined (CONFIG_DEBUG_FS) || (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,15))
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,15)
+#if !defined (CONFIG_DEBUG_FS) && !defined (CONFIG_DEBUG_FS_MODULE)
+#error "DebugFS is required and was not found in the kernel."
+#endif
+#else
+/* older kernels have no debugfs and older version of relayfs. */
#define STP_OLD_TRANSPORT
#endif