slackbuilds/academic/celestia/celestia-1.6.1-libpng15.patch

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imagecapture.cpp:184:40: error: Z_BEST_COMPRESSION was not declared in this scope
--- src/celestia/imagecapture.cpp
+++ src/celestia/imagecapture.cpp
@@ -31,6 +31,9 @@
#include "png.h"
#endif
+// Z_BEST_COMPRESSION
+#include <zlib.h>
+
// Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng
#ifndef png_jmpbuf
#define png_jmpbuf(png_ptr) png_ptr->jmpbuf