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-rw-r--r--gr-blocks/lib/file_source_impl.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gr-blocks/lib/file_source_impl.cc b/gr-blocks/lib/file_source_impl.cc
index a8db31be7..dcbd04210 100644
--- a/gr-blocks/lib/file_source_impl.cc
+++ b/gr-blocks/lib/file_source_impl.cc
@@ -24,6 +24,7 @@
#include "config.h"
#endif
+#include <gruel/thread.h>
#include "file_source_impl.h"
#include <gr_io_signature.h>
#include <cstdio>