Include stdio.h if debugging

src/hb-blob.c

@@ -39,6 +39,10 @@
 #define HB_DEBUG_BLOB HB_DEBUG
 #endif
 
+#if HB_DEBUG_BLOB
+#include <stdio.h>
+#endif
+
 struct _hb_blob_t {
   hb_reference_count_t ref_count;
 

src/hb-open-type-private.hh

@@ -117,6 +117,7 @@ struct Null <Type> \
 #endif
 
 #if HB_DEBUG_SANITIZE
+#include <stdio.h>
 #define TRACE_SANITIZE_ARG_DEF	, unsigned int sanitize_depth
 #define TRACE_SANITIZE_ARG	, sanitize_depth + 1
 #define TRACE_SANITIZE_ARG_INIT	, 1

src/hb-ot-layout-gsubgpos-private.hh

@@ -36,6 +36,7 @@
 #endif
 
 #if HB_DEBUG_APPLY
+#include <stdio.h>
 #define TRACE_APPLY_ARG_DEF	, unsigned int apply_depth
 #define TRACE_APPLY_ARG		, apply_depth + 1
 #define TRACE_APPLY_ARG_INIT	, 1