Include gstreamermm/private/element_p.h header to subclass Element.

diff --git a/include/libsigrokflow/libsigrokflow.hpp b/include/libsigrokflow/libsigrokflow.hpp
index 2c13cb4be875b77e6d1ef78624c258143589d3c2..72fdc9d3ee9e9b6b0ad1368112ad6b4d4ab0fd31 100644 (file)
--- a/include/libsigrokflow/libsigrokflow.hpp
+++ b/include/libsigrokflow/libsigrokflow.hpp
@@ -21,6 +21,7 @@
 #define LIBSIGROKFLOW_LIBSIGROKFLOW_HPP
 
 #include <gstreamermm.h>
+#include <gstreamermm/private/element_p.h>
 #include <libsigrokcxx/libsigrokcxx.hpp>
 
 namespace Srf