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-rw-r--r--gnuradio-core/src/lib/general/gr_head.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_head.cc b/gnuradio-core/src/lib/general/gr_head.cc
index cb07c84ddc..1726888113 100644
--- a/gnuradio-core/src/lib/general/gr_head.cc
+++ b/gnuradio-core/src/lib/general/gr_head.cc
@@ -26,6 +26,7 @@
#include <gr_head.h>
#include <gr_io_signature.h>
#include <string.h>
+#include <iostream>
gr_head::gr_head (size_t sizeof_stream_item, unsigned long long nitems)
: gr_sync_block ("head",