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-rw-r--r--contrib/visupng/PngFile.c1
-rw-r--r--contrib/visupng/VisualPng.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/contrib/visupng/PngFile.c b/contrib/visupng/PngFile.c
index ef0984e4d..dcde18a3a 100644
--- a/contrib/visupng/PngFile.c
+++ b/contrib/visupng/PngFile.c
@@ -13,6 +13,7 @@
#include <commdlg.h>
#include <stdio.h>
#include <stdlib.h>
+#include <zlib.h>
#include "png.h"
#include "pngfile.h"
diff --git a/contrib/visupng/VisualPng.c b/contrib/visupng/VisualPng.c
index 009f120e3..236525a59 100644
--- a/contrib/visupng/VisualPng.c
+++ b/contrib/visupng/VisualPng.c
@@ -27,6 +27,7 @@
#include <stdlib.h>
#include <string.h>
#include <windows.h>
+#include <zlib.h>
/* application includes */