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-rw-r--r--Build/source/texk/web2c/mplibdir/pngout.w1
1 files changed, 1 insertions, 0 deletions
diff --git a/Build/source/texk/web2c/mplibdir/pngout.w b/Build/source/texk/web2c/mplibdir/pngout.w
index eb838b0595f..5b9b6f34d4c 100644
--- a/Build/source/texk/web2c/mplibdir/pngout.w
+++ b/Build/source/texk/web2c/mplibdir/pngout.w
@@ -61,6 +61,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <math.h>
#include "mplib.h"
#include "mplibps.h" /* external header */
#include "mplibpng.h" /* external header */