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math-compat: don't re-define _USE_MATH_DEFINES if already defined
This avoids compiler warnings. https://bugzilla.gnome.org/show_bug.cgi?id=633886
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@ -23,7 +23,9 @@
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/* This header is not included automatically via gst/gst.h, you need to
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/* This header is not included automatically via gst/gst.h, you need to
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* include it explicitly if you need it. */
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* include it explicitly if you need it. */
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#ifndef _USE_MATH_DEFINES
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#define _USE_MATH_DEFINES /* so MSVC defines M_PI etc. */
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#define _USE_MATH_DEFINES /* so MSVC defines M_PI etc. */
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#endif
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#include <math.h>
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#include <math.h>
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#include <glib.h>
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#include <glib.h>
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