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-rw-r--r--contrib/visupng/VisualPng.c1
1 files changed, 1 insertions, 0 deletions
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 */