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Diffstat (limited to 'gnuradio-runtime/lib/vmcircbuf.h')
-rw-r--r--gnuradio-runtime/lib/vmcircbuf.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/vmcircbuf.h b/gnuradio-runtime/lib/vmcircbuf.h
index c3ddfe0043..f9ed045168 100644
--- a/gnuradio-runtime/lib/vmcircbuf.h
+++ b/gnuradio-runtime/lib/vmcircbuf.h
@@ -24,8 +24,11 @@
#define GR_VMCIRCBUF_H
#include <gnuradio/api.h>
+#include <gnuradio/thread/thread.h>
#include <vector>
+extern gr::thread::mutex s_vm_mutex;
+
namespace gr {
/*!