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-rw-r--r--src/include/c.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/c.h b/src/include/c.h
index f69d739be57..82f8e9d4c7b 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -75,6 +75,11 @@
#include <libintl.h>
#endif
+/* Define before including zlib.h to add const decorations to zlib API. */
+#ifdef HAVE_LIBZ
+#define ZLIB_CONST
+#endif
+
/* ----------------------------------------------------------------
* Section 1: compiler characteristics