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-rw-r--r--gtk2_ardour/fft_result.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/fft_result.h b/gtk2_ardour/fft_result.h
index dfab35a35f..d7895b0f60 100644
--- a/gtk2_ardour/fft_result.h
+++ b/gtk2_ardour/fft_result.h
@@ -20,6 +20,7 @@
#ifndef __ardour_fft_result_h
#define __ardour_fft_result_h
+#include <math.h>
#include <fftw3.h>
#include <gdkmm/color.h>