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-rw-r--r--src/gui/math3d/qmatrix4x4.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp
index 4e35d49118..d8c2116b0d 100644
--- a/src/gui/math3d/qmatrix4x4.cpp
+++ b/src/gui/math3d/qmatrix4x4.cpp
@@ -45,6 +45,8 @@
#include <QtGui/qmatrix.h>
#include <QtGui/qtransform.h>
+#include <cmath>
+
QT_BEGIN_NAMESPACE
#ifndef QT_NO_MATRIX4X4