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-rw-r--r--gr-qtgui/lib/HistogramDisplayPlot.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/gr-qtgui/lib/HistogramDisplayPlot.cc b/gr-qtgui/lib/HistogramDisplayPlot.cc
index 9798f21151..301cb13f17 100644
--- a/gr-qtgui/lib/HistogramDisplayPlot.cc
+++ b/gr-qtgui/lib/HistogramDisplayPlot.cc
@@ -34,6 +34,10 @@
#include <gnuradio/math.h>
#include <boost/math/special_functions/round.hpp>
+#ifdef _MSC_VER
+#define copysign _copysign
+#endif
+
class TimePrecisionClass
{
public: