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-rw-r--r--src/gui/math3d/qquaternion.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/gui/math3d/qquaternion.cpp b/src/gui/math3d/qquaternion.cpp
index 3f39fa43c3..2ccdd315d3 100644
--- a/src/gui/math3d/qquaternion.cpp
+++ b/src/gui/math3d/qquaternion.cpp
@@ -45,6 +45,8 @@
#include <QtCore/qvariant.h>
#include <QtCore/qdebug.h>
+#include <cmath>
+
QT_BEGIN_NAMESPACE
#ifndef QT_NO_QUATERNION